8640400

素因数分解:

$2^4\times 5^2\times {\mathrm{21601}}^1$

素因数の和:21619

約数の個数: 30

約数和(自身を含む): 20759522

約数和(自身を除く): 12119122

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 21601, 43202, 86404, 108005, 172808, 216010, 345616, 432020, 540025, 864040, 1080050, 1728080, 2160100, 4320200, 8640400]

約数ペア:

[(1, 8640400), (2, 4320200), (4, 2160100), (5, 1728080), (8, 1080050), (10, 864040), (16, 540025), (20, 432020), (25, 345616), (40, 216010), (50, 172808), (80, 108005), (100, 86404), (200, 43202), (400, 21601)]