21320905

素因数分解:

$5^1\times {\mathrm{43}}^1\times {\mathrm{131}}^1\times {\mathrm{757}}^1$

素因数の和:936

約数の個数: 16

約数和(自身を含む): 26414784

約数和(自身を除く): 5093879

約数列:

[1, 5, 43, 131, 215, 655, 757, 3785, 5633, 28165, 32551, 99167, 162755, 495835, 4264181, 21320905]

約数ペア:

[(1, 21320905), (5, 4264181), (43, 495835), (131, 162755), (215, 99167), (655, 32551), (757, 28165), (3785, 5633)]