15 (number)

15 (also written as fifteen or ten-five) is a number. It is between fourteen and sixteen, and is an odd number. It is divisible by 1, 3, 5, and 15.

This article is about the number fifteen. For the year, see 15.
← 14 15 16 →
Cardinalfifteen
Ordinal15th
(fifteenth)
Factorization3 × 5
Divisors1, 3, 5, 15
Greek numeralΙΕ´
Roman numeralXV
Binary11112
Ternary1203
Quaternary334
Quinary305
Senary236
Octal178
Duodecimal1312
HexadecimalF16
VigesimalF20
Base 36F36
Hebrewט"ו (Tet Vav)

In Roman numerals, 15 is written as XV.

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