18 (number)

← 17 18 19 →
Cardinaleighteen
Ordinal18th
(eighteenth)
Numeral systemoctodecimal
Factorization2 × 32
Divisors1, 2, 3, 6, 9, 18
Greek numeralΙΗ´
Roman numeralXVIII
Binary100102
Ternary2003
Senary306
Octal228
Duodecimal1612
Hexadecimal1216
Hebrew numeralי"ח
Babylonian numeral𒌋𒐜

18 (eighteen) is the natural number following 17 and preceding 19. It is an even composite number.