21195681

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{137}}^1\times {\mathrm{3967}}^1$

素因数の和:4120

約数の個数: 16

約数和(自身を含む): 30664704

約数和(自身を除く): 9469023

約数列:

[1, 3, 13, 39, 137, 411, 1781, 3967, 5343, 11901, 51571, 154713, 543479, 1630437, 7065227, 21195681]

約数ペア:

[(1, 21195681), (3, 7065227), (13, 1630437), (39, 543479), (137, 154713), (411, 51571), (1781, 11901), (3967, 5343)]