16991909

素因数分解:

${\mathrm{11}}^2\times {\mathrm{19}}^2\times {\mathrm{389}}^1$

素因数の和:449

約数の個数: 18

約数和(自身を含む): 19762470

約数和(自身を除く): 2770561

約数列:

[1, 11, 19, 121, 209, 361, 389, 2299, 3971, 4279, 7391, 43681, 47069, 81301, 140429, 894311, 1544719, 16991909]

約数ペア:

[(1, 16991909), (11, 1544719), (19, 894311), (121, 140429), (209, 81301), (361, 47069), (389, 43681), (2299, 7391), (3971, 4279)]