21502900

素因数分解:

$2^2\times 5^2\times {\mathrm{101}}^1\times {\mathrm{2129}}^1$

素因数の和:2244

約数の個数: 36

約数和(自身を含む): 47145420

約数和(自身を除く): 25642520

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 101, 202, 404, 505, 1010, 2020, 2129, 2525, 4258, 5050, 8516, 10100, 10645, 21290, 42580, 53225, 106450, 212900, 215029, 430058, 860116, 1075145, 2150290, 4300580, 5375725, 10751450, 21502900]

約数ペア:

[(1, 21502900), (2, 10751450), (4, 5375725), (5, 4300580), (10, 2150290), (20, 1075145), (25, 860116), (50, 430058), (100, 215029), (101, 212900), (202, 106450), (404, 53225), (505, 42580), (1010, 21290), (2020, 10645), (2129, 10100), (2525, 8516), (4258, 5050)]