20000

素因数分解:

$2^5\times 5^4$

素因数の和:30

約数の個数: 30

約数和(自身を含む): 49203

約数和(自身を除く): 29203

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 125, 160, 200, 250, 400, 500, 625, 800, 1000, 1250, 2000, 2500, 4000, 5000, 10000, 20000]

約数ペア:

[(1, 20000), (2, 10000), (4, 5000), (5, 4000), (8, 2500), (10, 2000), (16, 1250), (20, 1000), (25, 800), (32, 625), (40, 500), (50, 400), (80, 250), (100, 200), (125, 160)]