21390980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{2837}}^1$

素因数の和:2888

約数の個数: 48

約数和(自身を含む): 50062320

約数和(自身を除く): 28671340

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 29, 52, 58, 65, 116, 130, 145, 260, 290, 377, 580, 754, 1508, 1885, 2837, 3770, 5674, 7540, 11348, 14185, 28370, 36881, 56740, 73762, 82273, 147524, 164546, 184405, 329092, 368810, 411365, 737620, 822730, 1069549, 1645460, 2139098, 4278196, 5347745, 10695490, 21390980]

約数ペア:

[(1, 21390980), (2, 10695490), (4, 5347745), (5, 4278196), (10, 2139098), (13, 1645460), (20, 1069549), (26, 822730), (29, 737620), (52, 411365), (58, 368810), (65, 329092), (116, 184405), (130, 164546), (145, 147524), (260, 82273), (290, 73762), (377, 56740), (580, 36881), (754, 28370), (1508, 14185), (1885, 11348), (2837, 7540), (3770, 5674)]