21920015

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{17749}}^1$

素因数の和:17786

約数の個数: 16

約数和(自身を含む): 29820000

約数和(自身を除く): 7899985

約数列:

[1, 5, 13, 19, 65, 95, 247, 1235, 17749, 88745, 230737, 337231, 1153685, 1686155, 4384003, 21920015]

約数ペア:

[(1, 21920015), (5, 4384003), (13, 1686155), (19, 1153685), (65, 337231), (95, 230737), (247, 88745), (1235, 17749)]