21105425

素因数分解:

$5^2\times {\mathrm{11}}^2\times {\mathrm{6977}}^1$

素因数の和:7009

約数の個数: 18

約数和(自身を含む): 28770294

約数和(自身を除く): 7664869

約数列:

[1, 5, 11, 25, 55, 121, 275, 605, 3025, 6977, 34885, 76747, 174425, 383735, 844217, 1918675, 4221085, 21105425]

約数ペア:

[(1, 21105425), (5, 4221085), (11, 1918675), (25, 844217), (55, 383735), (121, 174425), (275, 76747), (605, 34885), (3025, 6977)]