21581859

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{17851}}^1$

素因数の和:17898

約数の個数: 16

約数和(自身を含む): 31990784

約数和(自身を除く): 10408925

約数列:

[1, 3, 13, 31, 39, 93, 403, 1209, 17851, 53553, 232063, 553381, 696189, 1660143, 7193953, 21581859]

約数ペア:

[(1, 21581859), (3, 7193953), (13, 1660143), (31, 696189), (39, 553381), (93, 232063), (403, 53553), (1209, 17851)]