19909981

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{331}}^1\times {\mathrm{661}}^1$

素因数の和:1012

約数の個数: 16

約数和(自身を含む): 24615808

約数和(自身を除く): 4705827

約数列:

[1, 7, 13, 91, 331, 661, 2317, 4303, 4627, 8593, 30121, 60151, 218791, 1531537, 2844283, 19909981]

約数ペア:

[(1, 19909981), (7, 2844283), (13, 1531537), (91, 218791), (331, 60151), (661, 30121), (2317, 8593), (4303, 4627)]