81508640

素因数分解:

$2^5\times 5^1\times {\mathrm{509429}}^1$

素因数の和:509444

約数の個数: 24

約数和(自身を含む): 192564540

約数和(自身を除く): 111055900

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 509429, 1018858, 2037716, 2547145, 4075432, 5094290, 8150864, 10188580, 16301728, 20377160, 40754320, 81508640]

約数ペア:

[(1, 81508640), (2, 40754320), (4, 20377160), (5, 16301728), (8, 10188580), (10, 8150864), (16, 5094290), (20, 4075432), (32, 2547145), (40, 2037716), (80, 1018858), (160, 509429)]