Compare 15 vs 20
| Property | 15 | 20 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 2 | 2 |
| Total factors | 2 | 3 |
| Prime factorization | 31 × 51 | 22 × 51 |
| Prime factorization | 3 × 5 | 2 × 2 × 5 |
| Divisors count | 4 | 6 |
| Divisors | 1, 3, 5, 15 | 1, 2, 4, 5, 10, 20 |
| Number of properties | 1 | 0 |
| Semiprimes | 6th | |
| Roman numberals | XV | XX |
| Base 2 | 11112 | 101002 |
| Base 3 | 1203 | 2023 |
| Base 4 | 334 | 1104 |
| Base 5 | 305 | 405 |
| Base 6 | 236 | 326 |
| Base 7 | 217 | 267 |
| Base 8 | 178 | 248 |
| Base 9 | 169 | 229 |
| Base 10 | 1510 | 2010 |
| Base 11 | 1411 | 1911 |
| Base 12 | 1312 | 1812 |
| Base 13 | 1213 | 1713 |
| Base 14 | 1114 | 1614 |
| Base 15 | 1015 | 1515 |
| Base 16 | f16 | 1416 |