21280790

素因数分解:

$2^1\times 5^1\times {\mathrm{89}}^1\times {\mathrm{23911}}^1$

素因数の和:24007

約数の個数: 16

約数和(自身を含む): 38737440

約数和(自身を除く): 17456650

約数列:

[1, 2, 5, 10, 89, 178, 445, 890, 23911, 47822, 119555, 239110, 2128079, 4256158, 10640395, 21280790]

約数ペア:

[(1, 21280790), (2, 10640395), (5, 4256158), (10, 2128079), (89, 239110), (178, 119555), (445, 47822), (890, 23911)]