18981475

素因数分解:

$5^2\times {\mathrm{19}}^1\times {\mathrm{89}}^1\times {\mathrm{449}}^1$

素因数の和:567

約数の個数: 24

約数和(自身を含む): 25110000

約数和(自身を除く): 6128525

約数列:

[1, 5, 19, 25, 89, 95, 445, 449, 475, 1691, 2225, 2245, 8455, 8531, 11225, 39961, 42275, 42655, 199805, 213275, 759259, 999025, 3796295, 18981475]

約数ペア:

[(1, 18981475), (5, 3796295), (19, 999025), (25, 759259), (89, 213275), (95, 199805), (445, 42655), (449, 42275), (475, 39961), (1691, 11225), (2225, 8531), (2245, 8455)]