21717620

素因数分解:

$2^2\times 5^1\times {\mathrm{1085881}}^1$

素因数の和:1085890

約数の個数: 12

約数和(自身を含む): 45607044

約数和(自身を除く): 23889424

約数列:

[1, 2, 4, 5, 10, 20, 1085881, 2171762, 4343524, 5429405, 10858810, 21717620]

約数ペア:

[(1, 21717620), (2, 10858810), (4, 5429405), (5, 4343524), (10, 2171762), (20, 1085881)]