21891805

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{139}}^1\times {\mathrm{2423}}^1$

素因数の和:2580

約数の個数: 16

約数和(自身を含む): 28506240

約数和(自身を除く): 6614435

約数列:

[1, 5, 13, 65, 139, 695, 1807, 2423, 9035, 12115, 31499, 157495, 336797, 1683985, 4378361, 21891805]

約数ペア:

[(1, 21891805), (5, 4378361), (13, 1683985), (65, 336797), (139, 157495), (695, 31499), (1807, 12115), (2423, 9035)]