# 20 (number)

 ← 19 20 →
Cardinaltwenty
Ordinal20th
(twentieth)
Factorization22· 5
Divisors1, 2, 4, 5, 10, 20
Roman numeralXX
Binary101002
Ternary2023
Quaternary1104
Quinary405
Senary326
Octal248
Duodecimal1812
Vigesimal1020
Base 36K36

Twenty is the number that is after nineteen and before twenty-one.

The prime factors of twenty are 2 and 5. (2 * 2 * 5 = 20)

Its factors are: 1, 2, 4, 5, 10, and 20. As the sum of its factors is more than itself (i.e. 22), it can be referred to as an abundant number.

20 can been used as a number base. Remnants of this system remain in some European languages, for example in the English “score” (20) and the French “quatre-vingts” (80, literally four groups of twenty). The old (pre-decimal) English monetary system had twenty shillings in a pound. The ancient Mayan numerical system – counting on fingers and toes – was a base 20 or "vigesimal" system.

A polyhedron of 20 faces is an icosahedron, one of the five Platonic solids. It is a convex regular polyhedron composed of twenty triangular faces, with five meeting at each of the twelve vertices. It has 30 edges and 12 vertices. Its dual polyhedron is the dodecahedron.

In Japanese tradition, adulthood is established at the age of 20. See seijin not hi (the celebration of adulthood in Japan).

It is the number of milk teeth in an infant’s mouth.

In Roman numerals, 20 is written as XX.

Other Languages
Alemannisch: Zwanzig
العربية: 20 (عدد)
azərbaycanca: 20 (ədəd)
تۆرکجه: ۲۰ (سایی)
Bân-lâm-gú: 20
български: 20 (число)
བོད་ཡིག: ༢༠ (གྲངས་ཀ།)
català: Vint
Чӑвашла: 20 (хисеп)
čeština: 20 (číslo)
chiShona: Makumi maviri
chiTumbuka: Makhumi na tubili
Cymraeg: Dau ddeg
dansk: 20 (tal)
Deutsch: Zwanzig
Ελληνικά: 20 (αριθμός)
emiliàn e rumagnòl: 20 (nùmer)
English: 20 (number)
español: Veinte
Esperanto: 20 (nombro)
euskara: Hogei
فارسی: ۲۰ (عدد)
føroyskt: 20 (tal)
français: 20 (nombre)
Fulfulde: Noogas
Gaeilge: 20 (uimhir)

한국어: 20
Hausa: Ashirin
հայերեն: Քսան
हिन्दी: २० (संख्या)
Bahasa Indonesia: 20 (angka)
interlingua: 20 (numero)
Iñupiak: Iñuiñaq
íslenska: 20 (tala)
italiano: 20 (numero)
עברית: 20 (מספר)
ქართული: 20 (რიცხვი)
Kirundi: Mirongo ibiri
Kiswahili: Ishirini
Kreyòl ayisyen: 20 (nonm)
kurdî: Bîst
лакку: Кьува
Latina: Viginti
latviešu: 20 (skaitlis)
lietuvių: 20 (skaičius)
lingála: Tuku míbalé
Luganda: Amakumi abiri
lumbaart: Nümar 20
magyar: 20 (szám)
македонски: 20 (број)
Bahasa Melayu: 20 (nombor)
Mìng-dĕ̤ng-ngṳ̄: 20
Nāhuatl: Cempōhualli
Na Vosa Vakaviti: Ruasagavulu
Nederlands: 20 (getal)

Napulitano: Vinte
norsk: 20 (tall)
norsk nynorsk: Talet 20
oʻzbekcha/ўзбекча: 20 (son)
پنجابی: 20
پښتو: ۲۰ (عدد)
polski: 20 (liczba)
português: Vinte
русский: 20 (число)
Gagana Samoa: 20 (numera)
Sesotho sa Leboa: 20 (nomoro)
slovenščina: 20 (število)
Soomaaliga: 20 (tiro)
کوردی: ٢٠ (ژمارە)
Sranantongo: Numro 20
српски / srpski: 20 (број)
suomi: 20 (luku)
svenska: 20 (tal)
Tagalog: 20 (bilang)
татарча/tatarça: 20 (сан)
ไทย: 20
ትግርኛ: ዕስራ
Türkçe: 20 (sayı)
тыва дыл: 20
українська: 20 (число)
اردو: 20 (عدد)
Vahcuengh: 20
vepsän kel’: 20 (lugu)
Tiếng Việt: 20 (số)
West-Vlams: 20 (getal)
Winaray: 20 (ihap)
ייִדיש: צוואנציק