20989820

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{10391}}^1$

素因数の和:10501

約数の個数: 24

約数和(自身を含む): 44519328

約数和(自身を除く): 23529508

約数列:

[1, 2, 4, 5, 10, 20, 101, 202, 404, 505, 1010, 2020, 10391, 20782, 41564, 51955, 103910, 207820, 1049491, 2098982, 4197964, 5247455, 10494910, 20989820]

約数ペア:

[(1, 20989820), (2, 10494910), (4, 5247455), (5, 4197964), (10, 2098982), (20, 1049491), (101, 207820), (202, 103910), (404, 51955), (505, 41564), (1010, 20782), (2020, 10391)]