20871890

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{160553}}^1$

素因数の和:160573

約数の個数: 16

約数和(自身を含む): 40459608

約数和(自身を除く): 19587718

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 160553, 321106, 802765, 1605530, 2087189, 4174378, 10435945, 20871890]

約数ペア:

[(1, 20871890), (2, 10435945), (5, 4174378), (10, 2087189), (13, 1605530), (26, 802765), (65, 321106), (130, 160553)]