21000785

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{29}}^1\times {\mathrm{857}}^1$

素因数の和:917

約数の個数: 24

約数和(自身を含む): 28262520

約数和(自身を除く): 7261735

約数列:

[1, 5, 13, 29, 65, 145, 169, 377, 845, 857, 1885, 4285, 4901, 11141, 24505, 24853, 55705, 124265, 144833, 323089, 724165, 1615445, 4200157, 21000785]

約数ペア:

[(1, 21000785), (5, 4200157), (13, 1615445), (29, 724165), (65, 323089), (145, 144833), (169, 124265), (377, 55705), (845, 24853), (857, 24505), (1885, 11141), (4285, 4901)]