21420580

素因数分解:

$2^2\times 5^1\times {\mathrm{1021}}^1\times {\mathrm{1049}}^1$

素因数の和:2079

約数の個数: 24

約数和(自身を含む): 45070200

約数和(自身を除く): 23649620

約数列:

[1, 2, 4, 5, 10, 20, 1021, 1049, 2042, 2098, 4084, 4196, 5105, 5245, 10210, 10490, 20420, 20980, 1071029, 2142058, 4284116, 5355145, 10710290, 21420580]

約数ペア:

[(1, 21420580), (2, 10710290), (4, 5355145), (5, 4284116), (10, 2142058), (20, 1071029), (1021, 20980), (1049, 20420), (2042, 10490), (2098, 10210), (4084, 5245), (4196, 5105)]