8400400

素因数分解:

$2^4\times 5^2\times {\mathrm{21001}}^1$

素因数の和:21019

約数の個数: 30

約数和(自身を含む): 20182922

約数和(自身を除く): 11782522

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 21001, 42002, 84004, 105005, 168008, 210010, 336016, 420020, 525025, 840040, 1050050, 1680080, 2100100, 4200200, 8400400]

約数ペア:

[(1, 8400400), (2, 4200200), (4, 2100100), (5, 1680080), (8, 1050050), (10, 840040), (16, 525025), (20, 420020), (25, 336016), (40, 210010), (50, 168008), (80, 105005), (100, 84004), (200, 42002), (400, 21001)]