21408985

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{4639}}^1$

素因数の和:4728

約数の個数: 16

約数和(自身を含む): 28062720

約数和(自身を除く): 6653735

約数列:

[1, 5, 13, 65, 71, 355, 923, 4615, 4639, 23195, 60307, 301535, 329369, 1646845, 4281797, 21408985]

約数ペア:

[(1, 21408985), (5, 4281797), (13, 1646845), (65, 329369), (71, 301535), (355, 60307), (923, 23195), (4615, 4639)]