20988980

素因数分解:

$2^2\times 5^1\times {\mathrm{239}}^1\times {\mathrm{4391}}^1$

素因数の和:4639

約数の個数: 24

約数和(自身を含む): 44271360

約数和(自身を除く): 23282380

約数列:

[1, 2, 4, 5, 10, 20, 239, 478, 956, 1195, 2390, 4391, 4780, 8782, 17564, 21955, 43910, 87820, 1049449, 2098898, 4197796, 5247245, 10494490, 20988980]

約数ペア:

[(1, 20988980), (2, 10494490), (4, 5247245), (5, 4197796), (10, 2098898), (20, 1049449), (239, 87820), (478, 43910), (956, 21955), (1195, 17564), (2390, 8782), (4391, 4780)]