21005500

素因数分解:

$2^2\times 5^3\times {\mathrm{43}}^1\times {\mathrm{977}}^1$

素因数の和:1039

約数の個数: 48

約数和(自身を含む): 46990944

約数和(自身を除く): 25985444

約数列:

[1, 2, 4, 5, 10, 20, 25, 43, 50, 86, 100, 125, 172, 215, 250, 430, 500, 860, 977, 1075, 1954, 2150, 3908, 4300, 4885, 5375, 9770, 10750, 19540, 21500, 24425, 42011, 48850, 84022, 97700, 122125, 168044, 210055, 244250, 420110, 488500, 840220, 1050275, 2100550, 4201100, 5251375, 10502750, 21005500]

約数ペア:

[(1, 21005500), (2, 10502750), (4, 5251375), (5, 4201100), (10, 2100550), (20, 1050275), (25, 840220), (43, 488500), (50, 420110), (86, 244250), (100, 210055), (125, 168044), (172, 122125), (215, 97700), (250, 84022), (430, 48850), (500, 42011), (860, 24425), (977, 21500), (1075, 19540), (1954, 10750), (2150, 9770), (3908, 5375), (4300, 4885)]