21576815

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{137}}^1\times {\mathrm{2423}}^1$

素因数の和:2578

約数の個数: 16

約数和(自身を含む): 28099008

約数和(自身を除く): 6522193

約数列:

[1, 5, 13, 65, 137, 685, 1781, 2423, 8905, 12115, 31499, 157495, 331951, 1659755, 4315363, 21576815]

約数ペア:

[(1, 21576815), (5, 4315363), (13, 1659755), (65, 331951), (137, 157495), (685, 31499), (1781, 12115), (2423, 8905)]