128700400

素因数分解:

$2^4\times 5^2\times {\mathrm{321751}}^1$

素因数の和:321769

約数の個数: 30

約数和(自身を含む): 309203672

約数和(自身を除く): 180503272

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 321751, 643502, 1287004, 1608755, 2574008, 3217510, 5148016, 6435020, 8043775, 12870040, 16087550, 25740080, 32175100, 64350200, 128700400]

約数ペア:

[(1, 128700400), (2, 64350200), (4, 32175100), (5, 25740080), (8, 16087550), (10, 12870040), (16, 8043775), (20, 6435020), (25, 5148016), (40, 3217510), (50, 2574008), (80, 1608755), (100, 1287004), (200, 643502), (400, 321751)]