81668540

素因数分解:

$2^2\times 5^1\times {\mathrm{4083427}}^1$

素因数の和:4083436

約数の個数: 12

約数和(自身を含む): 171503976

約数和(自身を除く): 89835436

約数列:

[1, 2, 4, 5, 10, 20, 4083427, 8166854, 16333708, 20417135, 40834270, 81668540]

約数ペア:

[(1, 81668540), (2, 40834270), (4, 20417135), (5, 16333708), (10, 8166854), (20, 4083427)]