20997665

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{211}}^1\times {\mathrm{1531}}^1$

素因数の和:1760

約数の個数: 16

約数和(自身を含む): 27281856

約数和(自身を除く): 6284191

約数列:

[1, 5, 13, 65, 211, 1055, 1531, 2743, 7655, 13715, 19903, 99515, 323041, 1615205, 4199533, 20997665]

約数ペア:

[(1, 20997665), (5, 4199533), (13, 1615205), (65, 323041), (211, 99515), (1055, 19903), (1531, 13715), (2743, 7655)]