Compare 1815 vs 1820
| Property | 1815 | 1820 |
|---|---|---|
| Type | composite number | composite number |
| Unique factors | 3 | 4 |
| Total factors | 4 | 5 |
| Prime factorization | 31 × 51 × 112 | 22 × 51 × 71 × 131 |
| Prime factorization | 3 × 5 × 11 × 11 | 2 × 2 × 5 × 7 × 13 |
| Divisors count | 12 | 24 |
| Divisors | 1, 3, 5, 11, 15, 33, 55, 121, 165, 363, 605, 1815 | 1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 52, 65, 70, 91, 130, 140, 182, 260, 364, 455, 910, 1820 |
| Number of properties | 0 | 0 |
| Roman numberals | MDCCCXV | MDCCCXX |
| Base 2 | 111000101112 | 111000111002 |
| Base 3 | 21110203 | 21111023 |
| Base 4 | 1301134 | 1301304 |
| Base 5 | 242305 | 242405 |
| Base 6 | 122236 | 122326 |
| Base 7 | 52027 | 52107 |
| Base 8 | 34278 | 34348 |
| Base 9 | 24369 | 24429 |
| Base 10 | 181510 | 182010 |
| Base 11 | 140011 | 140511 |
| Base 12 | 107312 | 107812 |
| Base 13 | a9813 | aa013 |
| Base 14 | 93914 | 94014 |
| Base 15 | 81015 | 81515 |
| Base 16 | 71716 | 71c16 |