20778875

素因数分解:

$5^3\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{673}}^1$

素因数の和:720

約数の個数: 32

約数和(自身を含む): 29440320

約数和(自身を除く): 8661445

約数列:

[1, 5, 13, 19, 25, 65, 95, 125, 247, 325, 475, 673, 1235, 1625, 2375, 3365, 6175, 8749, 12787, 16825, 30875, 43745, 63935, 84125, 166231, 218725, 319675, 831155, 1093625, 1598375, 4155775, 20778875]

約数ペア:

[(1, 20778875), (5, 4155775), (13, 1598375), (19, 1093625), (25, 831155), (65, 319675), (95, 218725), (125, 166231), (247, 84125), (325, 63935), (475, 43745), (673, 30875), (1235, 16825), (1625, 12787), (2375, 8749), (3365, 6175)]