15 (number)
15 (fifteen) is the natural number following 14 and preceding 16.
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| Cardinal | fifteen | |||
| Ordinal | 15th (fifteenth) | |||
| Numeral system | pentadecimal | |||
| Factorization | 3 × 5 | |||
| Divisors | 1, 3, 5, 15 | |||
| Greek numeral | ΙΕ´ | |||
| Roman numeral | XV | |||
| Binary | 11112 | |||
| Ternary | 1203 | |||
| Senary | 236 | |||
| Octal | 178 | |||
| Duodecimal | 1312 | |||
| Hexadecimal | F16 | |||
| Hebrew numeral | ט"ו / י"ה | |||
| Babylonian numeral | 𒌋𒐙 | |||
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