28720209

素因数分解:

$3^1\times 7^1\times {\mathrm{1061}}^1\times {\mathrm{1289}}^1$

素因数の和:2360

約数の個数: 16

約数和(自身を含む): 43839360

約数和(自身を除く): 15119151

約数列:

[1, 3, 7, 21, 1061, 1289, 3183, 3867, 7427, 9023, 22281, 27069, 1367629, 4102887, 9573403, 28720209]

約数ペア:

[(1, 28720209), (3, 9573403), (7, 4102887), (21, 1367629), (1061, 27069), (1289, 22281), (3183, 9023), (3867, 7427)]