20685580

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{67}}^1\times {\mathrm{359}}^1$

素因数の和:478

約数の個数: 48

約数和(自身を含む): 45239040

約数和(自身を除く): 24553460

約数列:

[1, 2, 4, 5, 10, 20, 43, 67, 86, 134, 172, 215, 268, 335, 359, 430, 670, 718, 860, 1340, 1436, 1795, 2881, 3590, 5762, 7180, 11524, 14405, 15437, 24053, 28810, 30874, 48106, 57620, 61748, 77185, 96212, 120265, 154370, 240530, 308740, 481060, 1034279, 2068558, 4137116, 5171395, 10342790, 20685580]

約数ペア:

[(1, 20685580), (2, 10342790), (4, 5171395), (5, 4137116), (10, 2068558), (20, 1034279), (43, 481060), (67, 308740), (86, 240530), (134, 154370), (172, 120265), (215, 96212), (268, 77185), (335, 61748), (359, 57620), (430, 48106), (670, 30874), (718, 28810), (860, 24053), (1340, 15437), (1436, 14405), (1795, 11524), (2881, 7180), (3590, 5762)]