21381380

素因数分解:

$2^2\times 5^1\times {\mathrm{449}}^1\times {\mathrm{2381}}^1$

素因数の和:2839

約数の個数: 24

約数和(自身を含む): 45019800

約数和(自身を除く): 23638420

約数列:

[1, 2, 4, 5, 10, 20, 449, 898, 1796, 2245, 2381, 4490, 4762, 8980, 9524, 11905, 23810, 47620, 1069069, 2138138, 4276276, 5345345, 10690690, 21381380]

約数ペア:

[(1, 21381380), (2, 10690690), (4, 5345345), (5, 4276276), (10, 2138138), (20, 1069069), (449, 47620), (898, 23810), (1796, 11905), (2245, 9524), (2381, 8980), (4490, 4762)]