20005000

素因数分解:

$2^3\times 5^4\times {\mathrm{4001}}^1$

素因数の和:4027

約数の個数: 40

約数和(自身を含む): 46883430

約数和(自身を除く): 26878430

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, 625, 1000, 1250, 2500, 4001, 5000, 8002, 16004, 20005, 32008, 40010, 80020, 100025, 160040, 200050, 400100, 500125, 800200, 1000250, 2000500, 2500625, 4001000, 5001250, 10002500, 20005000]

約数ペア:

[(1, 20005000), (2, 10002500), (4, 5001250), (5, 4001000), (8, 2500625), (10, 2000500), (20, 1000250), (25, 800200), (40, 500125), (50, 400100), (100, 200050), (125, 160040), (200, 100025), (250, 80020), (500, 40010), (625, 32008), (1000, 20005), (1250, 16004), (2500, 8002), (4001, 5000)]