21330815

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{389}}^1\times {\mathrm{997}}^1$

素因数の和:1402

約数の個数: 16

約数和(自身を含む): 28023840

約数和(自身を除く): 6693025

約数列:

[1, 5, 11, 55, 389, 997, 1945, 4279, 4985, 10967, 21395, 54835, 387833, 1939165, 4266163, 21330815]

約数ペア:

[(1, 21330815), (5, 4266163), (11, 1939165), (55, 387833), (389, 54835), (997, 21395), (1945, 10967), (4279, 4985)]