natural number From Wikipedia, the free encyclopedia

**15** (**fifteen**) is a number. It is between fourteen and sixteen, and is an odd number. It is divisible by 1, 3, 5, and 15.

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Cardinal | fifteen, fim | |||

Ordinal | 15th (fifteenth, fimth) | |||

Factorization | 3 × 5 | |||

Divisors | 1, 3, 5, 15 | |||

Greek numeral | ΙΕ´ | |||

Roman numeral | XV | |||

Binary | 1111_{2} | |||

Ternary | 120_{3} | |||

Quaternary | 33_{4} | |||

Quinary | 30_{5} | |||

Senary | 23_{6} | |||

Octal | 17_{8} | |||

Duodecimal | 13_{12} | |||

Hexadecimal | F_{16} | |||

Vigesimal | F_{20} | |||

Base 36 | F_{36} | |||

Hebrew | ט"ו (Tet Vav) |

In Roman numerals, 15 is written as **XV**.

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