408080

素因数分解:

$2^4\times 5^1\times {\mathrm{5101}}^1$

素因数の和:5114

約数の個数: 20

約数和(自身を含む): 948972

約数和(自身を除く): 540892

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 5101, 10202, 20404, 25505, 40808, 51010, 81616, 102020, 204040, 408080]

約数ペア:

[(1, 408080), (2, 204040), (4, 102020), (5, 81616), (8, 51010), (10, 40808), (16, 25505), (20, 20404), (40, 10202), (80, 5101)]