Compare 1920 vs 1931
| Property | 1920 | 1931 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 9 | 1 |
| Prime factorization | 27 × 31 × 51 | 19311 |
| Prime factorization | 2 × 2 × 2 × 2 × 2 × 2 × 2 × 3 × 5 | 1931 |
| Divisors count | 32 | 2 |
| Divisors | 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 48, 60, 64, 80, 96, 120, 128, 160, 192, 240, 320, 384, 480, 640, 960, 1920 | 1, 1931 |
| Number of properties | 0 | 5 |
| Chen primes | 182nd | |
| Harmonic primes | 108th | |
| Primes | 294th | |
| Sophie germain primes | 59th | |
| Twin primes (1st member) | 59th | |
| Roman numberals | MCMXX | MCMXXXI |
| Base 2 | 111100000002 | 111100010112 |
| Base 3 | 21220103 | 21221123 |
| Base 4 | 1320004 | 1320234 |
| Base 5 | 301405 | 302115 |
| Base 6 | 125206 | 125356 |
| Base 7 | 54127 | 54267 |
| Base 8 | 36008 | 36138 |
| Base 9 | 25639 | 25759 |
| Base 10 | 192010 | 193110 |
| Base 11 | 149611 | 14a611 |
| Base 12 | 114012 | 114b12 |
| Base 13 | b4913 | b5713 |
| Base 14 | 9b214 | 9bd14 |
| Base 15 | 88015 | 88b15 |
| Base 16 | 78016 | 78b16 |