21689421

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{139}}^1\times {\mathrm{4001}}^1$

素因数の和:4156

約数の個数: 16

約数和(自身を含む): 31375680

約数和(自身を除く): 9686259

約数列:

[1, 3, 13, 39, 139, 417, 1807, 4001, 5421, 12003, 52013, 156039, 556139, 1668417, 7229807, 21689421]

約数ペア:

[(1, 21689421), (3, 7229807), (13, 1668417), (39, 556139), (139, 156039), (417, 52013), (1807, 12003), (4001, 5421)]