643257428

素因数分解:

$2^2\times {\mathrm{11}}^1\times {\mathrm{691}}^1\times {\mathrm{21157}}^1$

素因数の和:21863

約数の個数: 24

約数和(自身を含む): 1229872224

約数和(自身を除く): 586614796

約数列:

[1, 2, 4, 11, 22, 44, 691, 1382, 2764, 7601, 15202, 21157, 30404, 42314, 84628, 232727, 465454, 930908, 14619487, 29238974, 58477948, 160814357, 321628714, 643257428]

約数ペア:

[(1, 643257428), (2, 321628714), (4, 160814357), (11, 58477948), (22, 29238974), (44, 14619487), (691, 930908), (1382, 465454), (2764, 232727), (7601, 84628), (15202, 42314), (21157, 30404)]