20991837

素因数分解:

$3^1\times {\mathrm{67}}^1\times {\mathrm{181}}^1\times {\mathrm{577}}^1$

素因数の和:828

約数の個数: 16

約数和(自身を含む): 28613312

約数和(自身を除く): 7621475

約数列:

[1, 3, 67, 181, 201, 543, 577, 1731, 12127, 36381, 38659, 104437, 115977, 313311, 6997279, 20991837]

約数ペア:

[(1, 20991837), (3, 6997279), (67, 313311), (181, 115977), (201, 104437), (543, 38659), (577, 36381), (1731, 12127)]