21207980

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{10499}}^1$

素因数の和:10609

約数の個数: 24

約数和(自身を含む): 44982000

約数和(自身を除く): 23774020

約数列:

[1, 2, 4, 5, 10, 20, 101, 202, 404, 505, 1010, 2020, 10499, 20998, 41996, 52495, 104990, 209980, 1060399, 2120798, 4241596, 5301995, 10603990, 21207980]

約数ペア:

[(1, 21207980), (2, 10603990), (4, 5301995), (5, 4241596), (10, 2120798), (20, 1060399), (101, 209980), (202, 104990), (404, 52495), (505, 41996), (1010, 20998), (2020, 10499)]