397290440

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{139891}}^1$

素因数の和:139973

約数の個数: 32

約数和(自身を含む): 906500160

約数和(自身を除く): 509209720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 142, 284, 355, 568, 710, 1420, 2840, 139891, 279782, 559564, 699455, 1119128, 1398910, 2797820, 5595640, 9932261, 19864522, 39729044, 49661305, 79458088, 99322610, 198645220, 397290440]

約数ペア:

[(1, 397290440), (2, 198645220), (4, 99322610), (5, 79458088), (8, 49661305), (10, 39729044), (20, 19864522), (40, 9932261), (71, 5595640), (142, 2797820), (284, 1398910), (355, 1119128), (568, 699455), (710, 559564), (1420, 279782), (2840, 139891)]