81800080

素因数分解:

$2^4\times 5^1\times {\mathrm{1022501}}^1$

素因数の和:1022514

約数の個数: 20

約数和(自身を含む): 190185372

約数和(自身を除く): 108385292

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1022501, 2045002, 4090004, 5112505, 8180008, 10225010, 16360016, 20450020, 40900040, 81800080]

約数ペア:

[(1, 81800080), (2, 40900040), (4, 20450020), (5, 16360016), (8, 10225010), (10, 8180008), (16, 5112505), (20, 4090004), (40, 2045002), (80, 1022501)]