19998125

素因数分解:

$5^4\times 7^2\times {\mathrm{653}}^1$

素因数の和:687

約数の個数: 30

約数和(自身を含む): 29114118

約数和(自身を除く): 9115993

約数列:

[1, 5, 7, 25, 35, 49, 125, 175, 245, 625, 653, 875, 1225, 3265, 4375, 4571, 6125, 16325, 22855, 30625, 31997, 81625, 114275, 159985, 408125, 571375, 799925, 2856875, 3999625, 19998125]

約数ペア:

[(1, 19998125), (5, 3999625), (7, 2856875), (25, 799925), (35, 571375), (49, 408125), (125, 159985), (175, 114275), (245, 81625), (625, 31997), (653, 30625), (875, 22855), (1225, 16325), (3265, 6125), (4375, 4571)]