15 (number)
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| ||||
|---|---|---|---|---|
| Cardinal | fifteen, fim | |||
| Ordinal | 15th (fifteenth, fimth) | |||
| Factorization | 3 · 5 | |||
| Divisors | 1, 3, 5, 15 | |||
| Roman numeral | XV | |||
| Binary | 11112 | |||
| Ternary | 1203 | |||
| Quaternary | 334 | |||
| Quinary | 305 | |||
| Senary | 236 | |||
| Octal | 178 | |||
| Duodecimal | 1312 | |||
| Hexadecimal | F16 | |||
| Vigesimal | F20 | |||
| Base 36 | F36 | |||
| Hebrew | ט"ו (Tet Vav) | |||
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.
In Roman numerals, 15 is written as XV.
15 (number) Media
The unique magic square of order 3.
The 15 perfect matchings of K6
15 as the difference of two positive squares (in orange).
Seashells from the mollusk Donax variabilis have 15 coloring pattern phenotypes.
