21147620

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{163}}^1\times {\mathrm{499}}^1$

素因数の和:684

約数の個数: 48

約数和(自身を含む): 48216000

約数和(自身を除く): 27068380

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 163, 260, 326, 499, 652, 815, 998, 1630, 1996, 2119, 2495, 3260, 4238, 4990, 6487, 8476, 9980, 10595, 12974, 21190, 25948, 32435, 42380, 64870, 81337, 129740, 162674, 325348, 406685, 813370, 1057381, 1626740, 2114762, 4229524, 5286905, 10573810, 21147620]

約数ペア:

[(1, 21147620), (2, 10573810), (4, 5286905), (5, 4229524), (10, 2114762), (13, 1626740), (20, 1057381), (26, 813370), (52, 406685), (65, 325348), (130, 162674), (163, 129740), (260, 81337), (326, 64870), (499, 42380), (652, 32435), (815, 25948), (998, 21190), (1630, 12974), (1996, 10595), (2119, 9980), (2495, 8476), (3260, 6487), (4238, 4990)]