20990125

素因数分解:

$5^3\times {\mathrm{13}}^1\times {\mathrm{12917}}^1$

素因数の和:12945

約数の個数: 16

約数和(自身を含む): 28212912

約数和(自身を除く): 7222787

約数列:

[1, 5, 13, 25, 65, 125, 325, 1625, 12917, 64585, 167921, 322925, 839605, 1614625, 4198025, 20990125]

約数ペア:

[(1, 20990125), (5, 4198025), (13, 1614625), (25, 839605), (65, 322925), (125, 167921), (325, 64585), (1625, 12917)]