20640850

素因数分解:

$2^1\times 5^2\times {\mathrm{53}}^1\times {\mathrm{7789}}^1$

素因数の和:7854

約数の個数: 24

約数和(自身を含む): 39121380

約数和(自身を除く): 18480530

約数列:

[1, 2, 5, 10, 25, 50, 53, 106, 265, 530, 1325, 2650, 7789, 15578, 38945, 77890, 194725, 389450, 412817, 825634, 2064085, 4128170, 10320425, 20640850]

約数ペア:

[(1, 20640850), (2, 10320425), (5, 4128170), (10, 2064085), (25, 825634), (50, 412817), (53, 389450), (106, 194725), (265, 77890), (530, 38945), (1325, 15578), (2650, 7789)]