21281855

素因数分解:

$5^1\times 7^1\times {\mathrm{113}}^1\times {\mathrm{5381}}^1$

素因数の和:5506

約数の個数: 16

約数和(自身を含む): 29450304

約数和(自身を除く): 8168449

約数列:

[1, 5, 7, 35, 113, 565, 791, 3955, 5381, 26905, 37667, 188335, 608053, 3040265, 4256371, 21281855]

約数ペア:

[(1, 21281855), (5, 4256371), (7, 3040265), (35, 608053), (113, 188335), (565, 37667), (791, 26905), (3955, 5381)]