21530509

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{137}}^1\times {\mathrm{157}}^1$

素因数の和:325

約数の個数: 32

約数和(自身を含む): 29304576

約数和(自身を除く): 7774067

約数列:

[1, 7, 11, 13, 77, 91, 137, 143, 157, 959, 1001, 1099, 1507, 1727, 1781, 2041, 10549, 12089, 12467, 14287, 19591, 21509, 22451, 137137, 150563, 157157, 236599, 279617, 1656193, 1957319, 3075787, 21530509]

約数ペア:

[(1, 21530509), (7, 3075787), (11, 1957319), (13, 1656193), (77, 279617), (91, 236599), (137, 157157), (143, 150563), (157, 137137), (959, 22451), (1001, 21509), (1099, 19591), (1507, 14287), (1727, 12467), (1781, 12089), (2041, 10549)]