20421640

素因数分解:

$2^3\times 5^1\times {\mathrm{307}}^1\times {\mathrm{1663}}^1$

素因数の和:1981

約数の個数: 32

約数和(自身を含む): 46126080

約数和(自身を除く): 25704440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 307, 614, 1228, 1535, 1663, 2456, 3070, 3326, 6140, 6652, 8315, 12280, 13304, 16630, 33260, 66520, 510541, 1021082, 2042164, 2552705, 4084328, 5105410, 10210820, 20421640]

約数ペア:

[(1, 20421640), (2, 10210820), (4, 5105410), (5, 4084328), (8, 2552705), (10, 2042164), (20, 1021082), (40, 510541), (307, 66520), (614, 33260), (1228, 16630), (1535, 13304), (1663, 12280), (2456, 8315), (3070, 6652), (3326, 6140)]