20872100

素因数分解:

$2^2\times 5^2\times {\mathrm{208721}}^1$

素因数の和:208735

約数の個数: 18

約数和(自身を含む): 45292674

約数和(自身を除く): 24420574

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 208721, 417442, 834884, 1043605, 2087210, 4174420, 5218025, 10436050, 20872100]

約数ペア:

[(1, 20872100), (2, 10436050), (4, 5218025), (5, 4174420), (10, 2087210), (20, 1043605), (25, 834884), (50, 417442), (100, 208721)]