639082580

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^2\times {\mathrm{19009}}^1$

素因数の和:19100

約数の個数: 36

約数和(自身を含む): 1375677660

約数和(自身を除く): 736595080

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 1681, 3362, 6724, 8405, 16810, 19009, 33620, 38018, 76036, 95045, 190090, 380180, 779369, 1558738, 3117476, 3896845, 7793690, 15587380, 31954129, 63908258, 127816516, 159770645, 319541290, 639082580]

約数ペア:

[(1, 639082580), (2, 319541290), (4, 159770645), (5, 127816516), (10, 63908258), (20, 31954129), (41, 15587380), (82, 7793690), (164, 3896845), (205, 3117476), (410, 1558738), (820, 779369), (1681, 380180), (3362, 190090), (6724, 95045), (8405, 76036), (16810, 38018), (19009, 33620)]