Compare 811 vs 820
| Property | 811 | 820 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 3 |
| Total factors | 1 | 4 |
| Prime factorization | 8111 | 22 × 51 × 411 |
| Prime factorization | 811 | 2 × 2 × 5 × 41 |
| Divisors count | 2 | 12 |
| Divisors | 1, 811 | 1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820 |
| Number of properties | 4 | 0 |
| Chen primes | 96th | |
| Long primes | 49th | |
| Primes | 141st | |
| Twin primes (2nd member) | 31st | |
| Roman numberals | DCCCXI | DCCCXX |
| Base 2 | 11001010112 | 11001101002 |
| Base 3 | 10100013 | 10101013 |
| Base 4 | 302234 | 303104 |
| Base 5 | 112215 | 112405 |
| Base 6 | 34316 | 34446 |
| Base 7 | 22367 | 22517 |
| Base 8 | 14538 | 14648 |
| Base 9 | 11019 | 11119 |
| Base 10 | 81110 | 82010 |
| Base 11 | 67811 | 68611 |
| Base 12 | 57712 | 58412 |
| Base 13 | 4a513 | 4b113 |
| Base 14 | 41d14 | 42814 |
| Base 15 | 39115 | 39a15 |
| Base 16 | 32b16 | 33416 |