19721980

素因数分解:

$2^2\times 5^1\times {\mathrm{409}}^1\times {\mathrm{2411}}^1$

素因数の和:2829

約数の個数: 24

約数和(自身を含む): 41534640

約数和(自身を除く): 21812660

約数列:

[1, 2, 4, 5, 10, 20, 409, 818, 1636, 2045, 2411, 4090, 4822, 8180, 9644, 12055, 24110, 48220, 986099, 1972198, 3944396, 4930495, 9860990, 19721980]

約数ペア:

[(1, 19721980), (2, 9860990), (4, 4930495), (5, 3944396), (10, 1972198), (20, 986099), (409, 48220), (818, 24110), (1636, 12055), (2045, 9644), (2411, 8180), (4090, 4822)]