21239620

素因数分解:

$2^2\times 5^1\times {\mathrm{251}}^1\times {\mathrm{4231}}^1$

素因数の和:4491

約数の個数: 24

約数和(自身を含む): 44791488

約数和(自身を除く): 23551868

約数列:

[1, 2, 4, 5, 10, 20, 251, 502, 1004, 1255, 2510, 4231, 5020, 8462, 16924, 21155, 42310, 84620, 1061981, 2123962, 4247924, 5309905, 10619810, 21239620]

約数ペア:

[(1, 21239620), (2, 10619810), (4, 5309905), (5, 4247924), (10, 2123962), (20, 1061981), (251, 84620), (502, 42310), (1004, 21155), (1255, 16924), (2510, 8462), (4231, 5020)]