21390772

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{411361}}^1$

素因数の和:411378

約数の個数: 12

約数和(自身を含む): 40313476

約数和(自身を除く): 18922704

約数列:

[1, 2, 4, 13, 26, 52, 411361, 822722, 1645444, 5347693, 10695386, 21390772]

約数ペア:

[(1, 21390772), (2, 10695386), (4, 5347693), (13, 1645444), (26, 822722), (52, 411361)]