6400400

素因数分解:

$2^4\times 5^2\times {\mathrm{16001}}^1$

素因数の和:16019

約数の個数: 30

約数和(自身を含む): 15377922

約数和(自身を除く): 8977522

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 16001, 32002, 64004, 80005, 128008, 160010, 256016, 320020, 400025, 640040, 800050, 1280080, 1600100, 3200200, 6400400]

約数ペア:

[(1, 6400400), (2, 3200200), (4, 1600100), (5, 1280080), (8, 800050), (10, 640040), (16, 400025), (20, 320020), (25, 256016), (40, 160010), (50, 128008), (80, 80005), (100, 64004), (200, 32002), (400, 16001)]