21228980

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{25889}}^1$

素因数の和:25939

約数の個数: 24

約数和(自身を含む): 45669960

約数和(自身を除く): 24440980

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 25889, 51778, 103556, 129445, 258890, 517780, 1061449, 2122898, 4245796, 5307245, 10614490, 21228980]

約数ペア:

[(1, 21228980), (2, 10614490), (4, 5307245), (5, 4245796), (10, 2122898), (20, 1061449), (41, 517780), (82, 258890), (164, 129445), (205, 103556), (410, 51778), (820, 25889)]