400100

素因数分解:

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

素因数の和:4015

約数の個数: 18

約数和(自身を含む): 868434

約数和(自身を除く): 468334

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 4001, 8002, 16004, 20005, 40010, 80020, 100025, 200050, 400100]

約数ペア:

[(1, 400100), (2, 200050), (4, 100025), (5, 80020), (10, 40010), (20, 20005), (25, 16004), (50, 8002), (100, 4001)]