81620720

素因数分解:

$2^4\times 5^1\times {\mathrm{1020259}}^1$

素因数の和:1020272

約数の個数: 20

約数和(自身を含む): 189768360

約数和(自身を除く): 108147640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1020259, 2040518, 4081036, 5101295, 8162072, 10202590, 16324144, 20405180, 40810360, 81620720]

約数ペア:

[(1, 81620720), (2, 40810360), (4, 20405180), (5, 16324144), (8, 10202590), (10, 8162072), (16, 5101295), (20, 4081036), (40, 2040518), (80, 1020259)]