21128920

素因数分解:

$2^3\times 5^1\times {\mathrm{528223}}^1$

素因数の和:528234

約数の個数: 16

約数和(自身を含む): 47540160

約数和(自身を除く): 26411240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 528223, 1056446, 2112892, 2641115, 4225784, 5282230, 10564460, 21128920]

約数ペア:

[(1, 21128920), (2, 10564460), (4, 5282230), (5, 4225784), (8, 2641115), (10, 2112892), (20, 1056446), (40, 528223)]