20400400

素因数分解:

$2^4\times 5^2\times {\mathrm{51001}}^1$

素因数の和:51019

約数の個数: 30

約数和(自身を含む): 49012922

約数和(自身を除く): 28612522

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 51001, 102002, 204004, 255005, 408008, 510010, 816016, 1020020, 1275025, 2040040, 2550050, 4080080, 5100100, 10200200, 20400400]

約数ペア:

[(1, 20400400), (2, 10200200), (4, 5100100), (5, 4080080), (8, 2550050), (10, 2040040), (16, 1275025), (20, 1020020), (25, 816016), (40, 510010), (50, 408008), (80, 255005), (100, 204004), (200, 102002), (400, 51001)]