21128080

素因数分解:

$2^4\times 5^1\times {\mathrm{264101}}^1$

素因数の和:264114

約数の個数: 20

約数和(自身を含む): 49122972

約数和(自身を除く): 27994892

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 264101, 528202, 1056404, 1320505, 2112808, 2641010, 4225616, 5282020, 10564040, 21128080]

約数ペア:

[(1, 21128080), (2, 10564040), (4, 5282020), (5, 4225616), (8, 2641010), (10, 2112808), (16, 1320505), (20, 1056404), (40, 528202), (80, 264101)]