| Nominal | 20491 |
| Cardinal | twenty thousand four hundred ninety-one |
Cardinal twenty thousand four hundred ninety-one | |
| Ordinal | 20,491st |
| Number of digits | 5 |
| Sum of digits | 16 |
| Product of digits | 0 |
| Number parity | Odd |
| Prime factorization | 31 x 661 |
| Prime factors | 31, 661 |
| Number of distinct prime factors ω(n) | 2 |
| Total number of prime factors Ω(n) | 2 |
| Sum of prime factors | 692 |
| Product of prime factors | 20491 |
| Is 20491 a prime number? | No |
| Is 20491 a semiprime number? | Yes |
| Is 20491 a Chen prime number? | No |
| Is 20491 a Mersenne prime number? | No |
| Is 20491 a Catalan number? | No |
| Is 20491 a Fibonacci number? | No |
| Is 20491 a Idoneal number? | No |
| Square of 20491 (n2) | 419881081 |
| Cube of 20491 (n3) | 8603783230771 |
| Square root of 20491 | 143.14677781913 |
| Natural Logarithm (ln) of 20491 | 9.9277410443368 |
| Decimal Logarithm (log) of 20491 | 4.3115631533199 |
| Sine of 20491 | 0.99927492869237 |
| Cosecant of 20491 | 1.0007255974175 |
| Cosine of 20491 | 0.038073834675004 |
| Secant of 20491 | 26.264756585092 |
| Tangent of 20491 | 26.24571276369 |
| Cotangent of 20491 | 0.038101460951118 |
| The spelling of 20491 in words is "twenty thousand four hundred ninety-one", meaning that: |
| 20491 is not an aban number (as it contains the letter a) |
| 20491 is not an eban number (as it contains the letter e) |
| 20491 is not an iban number (as it contains the letter i) |
| 20491 is not an oban number (as it contains the letter o) |
| 20491 is not a tban number (as it contains the letter t) |
| 20491 is not an uban number (as it contains the letter u) |
| Bengali numerals | ২০৪৯১ |
| Eastern Arabic numerals | ٢٠٬٤٩١ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓂭𓍥𓎎𓏺 |
| Khmer numerals | ២០៤៩១ |
| Japanese numerals | 二万四百九十一 |
| Roman numerals | n/a |
| Thai numerals | ๒๐๔๙๑ |
| Arabic | عشرون ألف و أربعة مائة و واحد و تسعون |
| Croatian | dvadeset tisuća četiristo devedeset i jedan |
| Czech | dvacet tisíc čtyři sta devadesát jeden |
| Danish | tyve tusinde fire hundrede en og halvfems |
| Dutch | twintigduizend vierhonderdéénennegentig |
| Estonian | akpe blaeve alafa ene blaasieke vɔ ɖekɛ |
| Faroese | tjúgo tusin og fýrehundraðognítiein |
| Filipino | dalawáng pû libó’t ápat na daán at siyám na pû’t isá |
| Finnish | kaksikymmentätuhattaneljäsataayhdeksänkymmentäyksi |
| French | vingt mille quatre cent quatre-vingt-onze |
| Greek | είκοσι χίλιάδες τετρακόσια εννενήντα ένα |
| German | zwanzigtausendvierhunderteinundneunzig |
| Hebrew | עשרים אלף ארבע מאות תשעים ואחת |
| Hindi | बीस हज़ार चार सौ इक्यानबे |
| Hungarian | húszezernégyszázkilencvenegy |
| Icelandic | tuttugu þúsund og fjögurhundrað og níutíu og einn |
| Indonesian | dua puluh ribu empat ratus sembilan puluh satu |
| Italian | ventimilaquattrocentonovantuno |
| Japanese | 二万四百九十一 |
| Korean | 이만 사백구십일 |
| Latvian | divdesmit tūkstoši četrsimt deviņdesmit viens |
| Lithuanian | dvidešimt tūkstančių keturi šimtai devyniasdešimt vienas |
| Norwegian | tjue tusen fire hundre og nittién |
| Persian | بیست هزار و چهارصد و نود و یک |
| Polish | dwadzieścia tysięcy czterysta dziewięćdziesiąt jeden |
| Portuguese | vinte mil quatrocentos e noventa e um |
| Romanian | douăzeci mii patru sute nouăzeci şi unu |
| Russian | двадцать тысяч четыреста девяносто один |
| Serbian | двадесет хиљада четиристо деведесет и један |
| Slovak | dvadsať tisíc štyristo deväťdesiatjeden |
| Slovene | dvaset tisuću štiristo devetdeset ena |
| Spanish | veinte mil cuatrocientos noventa y uno |
| Swahili | elfu ishirini, mia nne na tisini na moja |
| Swedish | tjugotusenfyrahundranittioen |
| Thai | สองหมื่นสี่ร้อยเก้าสิบเอ็ด |
| Turkish | yirmi bin dört yüz doksan bir |
| Ukrainian | двадцять тисяч чотириста девʼяносто один |
| Vietnamese | hai mươi nghìn bốn trăm chín mươi mốt |
| Number 20491 reversed | 19402 | |
| Unicode Character | U+500B | 個 |
| Unix Timestamp | Thu, 01 Jan 1970 05:41:31 +0000 | |