1600400

素因数分解:

$2^4\times 5^2\times {\mathrm{4001}}^1$

素因数の和:4019

約数の個数: 30

約数和(自身を含む): 3845922

約数和(自身を除く): 2245522

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 4001, 8002, 16004, 20005, 32008, 40010, 64016, 80020, 100025, 160040, 200050, 320080, 400100, 800200, 1600400]

約数ペア:

[(1, 1600400), (2, 800200), (4, 400100), (5, 320080), (8, 200050), (10, 160040), (16, 100025), (20, 80020), (25, 64016), (40, 40010), (50, 32008), (80, 20005), (100, 16004), (200, 8002), (400, 4001)]