21287620

素因数分解:

$2^2\times 5^1\times {\mathrm{97}}^1\times {\mathrm{10973}}^1$

素因数の和:11079

約数の個数: 24

約数和(自身を含む): 45168984

約数和(自身を除く): 23881364

約数列:

[1, 2, 4, 5, 10, 20, 97, 194, 388, 485, 970, 1940, 10973, 21946, 43892, 54865, 109730, 219460, 1064381, 2128762, 4257524, 5321905, 10643810, 21287620]

約数ペア:

[(1, 21287620), (2, 10643810), (4, 5321905), (5, 4257524), (10, 2128762), (20, 1064381), (97, 219460), (194, 109730), (388, 54865), (485, 43892), (970, 21946), (1940, 10973)]