320080

素因数分解:

$2^4\times 5^1\times {\mathrm{4001}}^1$

素因数の和:4014

約数の個数: 20

約数和(自身を含む): 744372

約数和(自身を除く): 424292

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 4001, 8002, 16004, 20005, 32008, 40010, 64016, 80020, 160040, 320080]

約数ペア:

[(1, 320080), (2, 160040), (4, 80020), (5, 64016), (8, 40010), (10, 32008), (16, 20005), (20, 16004), (40, 8002), (80, 4001)]