21904519

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{137}}^1\times {\mathrm{251}}^1$

素因数の和:415

約数の個数: 24

約数和(自身を含む): 27751248

約数和(自身を除く): 5846729

約数列:

[1, 7, 13, 49, 91, 137, 251, 637, 959, 1757, 1781, 3263, 6713, 12299, 12467, 22841, 34387, 87269, 159887, 240709, 447031, 1684963, 3129217, 21904519]

約数ペア:

[(1, 21904519), (7, 3129217), (13, 1684963), (49, 447031), (91, 240709), (137, 159887), (251, 87269), (637, 34387), (959, 22841), (1757, 12467), (1781, 12299), (3263, 6713)]