19998875

素因数分解:

$5^3\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{397}}^1$

素因数の和:456

約数の個数: 32

約数和(自身を含む): 27815424

約数和(自身を除く): 7816549

約数列:

[1, 5, 13, 25, 31, 65, 125, 155, 325, 397, 403, 775, 1625, 1985, 2015, 3875, 5161, 9925, 10075, 12307, 25805, 49625, 50375, 61535, 129025, 159991, 307675, 645125, 799955, 1538375, 3999775, 19998875]

約数ペア:

[(1, 19998875), (5, 3999775), (13, 1538375), (25, 799955), (31, 645125), (65, 307675), (125, 159991), (155, 129025), (325, 61535), (397, 50375), (403, 49625), (775, 25805), (1625, 12307), (1985, 10075), (2015, 9925), (3875, 5161)]