638950

素因数分解:

$2^1\times 5^2\times {\mathrm{13}}^1\times {\mathrm{983}}^1$

素因数の和:1008

約数の個数: 24

約数和(自身を含む): 1281168

約数和(自身を除く): 642218

約数列:

[1, 2, 5, 10, 13, 25, 26, 50, 65, 130, 325, 650, 983, 1966, 4915, 9830, 12779, 24575, 25558, 49150, 63895, 127790, 319475, 638950]

約数ペア:

[(1, 638950), (2, 319475), (5, 127790), (10, 63895), (13, 49150), (25, 25558), (26, 24575), (50, 12779), (65, 9830), (130, 4915), (325, 1966), (650, 983)]