21238520

素因数分解:

$2^3\times 5^1\times {\mathrm{223}}^1\times {\mathrm{2381}}^1$

素因数の和:2615

約数の個数: 32

約数和(自身を含む): 48021120

約数和(自身を除く): 26782600

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 223, 446, 892, 1115, 1784, 2230, 2381, 4460, 4762, 8920, 9524, 11905, 19048, 23810, 47620, 95240, 530963, 1061926, 2123852, 2654815, 4247704, 5309630, 10619260, 21238520]

約数ペア:

[(1, 21238520), (2, 10619260), (4, 5309630), (5, 4247704), (8, 2654815), (10, 2123852), (20, 1061926), (40, 530963), (223, 95240), (446, 47620), (892, 23810), (1115, 19048), (1784, 11905), (2230, 9524), (2381, 8920), (4460, 4762)]