720080

素因数分解:

$2^4\times 5^1\times {\mathrm{9001}}^1$

素因数の和:9014

約数の個数: 20

約数和(自身を含む): 1674372

約数和(自身を除く): 954292

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 9001, 18002, 36004, 45005, 72008, 90010, 144016, 180020, 360040, 720080]

約数ペア:

[(1, 720080), (2, 360040), (4, 180020), (5, 144016), (8, 90010), (10, 72008), (16, 45005), (20, 36004), (40, 18002), (80, 9001)]