| Nominal | 20999 |
| Cardinal | twenty thousand nine hundred ninety-nine |
Cardinal twenty thousand nine hundred ninety-nine | |
| Ordinal | 20,999th |
| Number of digits | 5 |
| Sum of digits | 29 |
| Product of digits | 0 |
| Number parity | Odd |
| Prime factorization | 11 x 23 x 83 |
| Prime factors | 11, 23, 83 |
| Number of distinct prime factors ω(n) | 3 |
| Total number of prime factors Ω(n) | 3 |
| Sum of prime factors | 117 |
| Product of prime factors | 20999 |
| Is 20999 a prime number? | No |
| Is 20999 a semiprime number? | No |
| Is 20999 a Chen prime number? | No |
| Is 20999 a Mersenne prime number? | No |
| Is 20999 a Catalan number? | No |
| Is 20999 a Fibonacci number? | No |
| Is 20999 a Idoneal number? | No |
| Square of 20999 (n2) | 440958001 |
| Cube of 20999 (n3) | 9259677062999 |
| Square root of 20999 | 144.91031709302 |
| Natural Logarithm (ln) of 20999 | 9.9522300965241 |
| Decimal Logarithm (log) of 20999 | 4.3221986135519 |
| Sine of 20999 | 0.56026310582562 |
| Cosecant of 20999 | 1.7848756942979 |
| Cosine of 20999 | 0.82831470604513 |
| Secant of 20999 | 1.2072706094699 |
| Tangent of 20999 | 0.6763891812336 |
| Cotangent of 20999 | 1.4784387860495 |
| The spelling of 20999 in words is "twenty thousand nine hundred ninety-nine", meaning that: |
| 20999 is not an aban number (as it contains the letter a) |
| 20999 is not an eban number (as it contains the letter e) |
| 20999 is not an iban number (as it contains the letter i) |
| 20999 is not an oban number (as it contains the letter o) |
| 20999 is not a tban number (as it contains the letter t) |
| 20999 is not an uban number (as it contains the letter u) |
| Bengali numerals | ২০৯৯৯ |
| Eastern Arabic numerals | ٢٠٬٩٩٩ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓂭𓍪𓎎𓐂 |
| Khmer numerals | ២០៩៩៩ |
| Japanese numerals | 二万九百九十九 |
| Roman numerals | n/a |
| Thai numerals | ๒๐๙๙๙ |
| Arabic | عشرون ألف و تسعة مائة و تسعة و تسعون |
| Croatian | dvadeset tisuća devetsto devedeset i devet |
| Czech | dvacet tisíc devět set devadesát devět |
| Danish | tyve tusinde ni hundrede ni og halvfems |
| Dutch | twintigduizend negenhonderdnegenennegentig |
| Estonian | akpe blaeve alafa asieke blaasieke vɔ asieke |
| Faroese | tjúgo tusin og níggjuhundraðognítiníggju |
| Filipino | dalawáng pû libó’t siyám na daán at siyám na pû’t siyám |
| Finnish | kaksikymmentätuhattayhdeksänsataayhdeksänkymmentäyhdeksän |
| French | vingt mille neuf cent quatre-vingt-dix-neuf |
| Greek | είκοσι χίλιάδες εννιακόσια εννενήντα εννέα |
| German | zwanzigtausendneunhundertneunundneunzig |
| Hebrew | עשרים אלף תשע מאות תשעים ותשע |
| Hindi | बीस हज़ार नौ सौ निन्यानबे |
| Hungarian | húszezerkilencszázkilencvenkilenc |
| Icelandic | tuttugu þúsund og níuhundrað og níutíu og níu |
| Indonesian | dua puluh ribu sembilan ratus sembilan puluh sembilan |
| Italian | ventimilanovecentonovantanove |
| Japanese | 二万九百九十九 |
| Korean | 이만 구백구십구 |
| Latvian | divdesmit tūkstoši deviņsimt deviņdesmit deviņi |
| Lithuanian | dvidešimt tūkstančių devyni šimtai devyniasdešimt devyni |
| Norwegian | tjue tusen ni hundre og nittini |
| Persian | بیست هزار و نهصد و نود و نه |
| Polish | dwadzieścia tysięcy dziewięćset dziewięćdziesiąt dziewięć |
| Portuguese | vinte mil novecentos e noventa e nove |
| Romanian | douăzeci mii nouă sute nouăzeci şi nouă |
| Russian | двадцать тысяч девятьсот девяносто девять |
| Serbian | двадесет хиљада деветсто деведесет и девет |
| Slovak | dvadsať tisíc deväťsto deväťdesiatdeväť |
| Slovene | dvaset tisuću devetsto devetdeset devet |
| Spanish | veinte mil novecientos noventa y nueve |
| Swahili | elfu ishirini, mia tisa na tisini na tisa |
| Swedish | tjugotusenniohundranittionio |
| Thai | สองหมื่นเก้าร้อยเก้าสิบเก้า |
| Turkish | yirmi bin dokuz yüz doksan dokuz |
| Ukrainian | двадцять тисяч девʼятсот девʼяносто девʼять |
| Vietnamese | hai mươi nghìn chín trăm chín mươi chín |
| Number 20999 reversed | 99902 | |
| Unicode Character | U+5207 | 切 |
| Unix Timestamp | Thu, 01 Jan 1970 05:49:59 +0000 | |