20717800

素因数分解:

$2^3\times 5^2\times {\mathrm{71}}^1\times {\mathrm{1459}}^1$

素因数の和:1546

約数の個数: 48

約数和(自身を含む): 48880800

約数和(自身を除く): 28163000

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 71, 100, 142, 200, 284, 355, 568, 710, 1420, 1459, 1775, 2840, 2918, 3550, 5836, 7100, 7295, 11672, 14200, 14590, 29180, 36475, 58360, 72950, 103589, 145900, 207178, 291800, 414356, 517945, 828712, 1035890, 2071780, 2589725, 4143560, 5179450, 10358900, 20717800]

約数ペア:

[(1, 20717800), (2, 10358900), (4, 5179450), (5, 4143560), (8, 2589725), (10, 2071780), (20, 1035890), (25, 828712), (40, 517945), (50, 414356), (71, 291800), (100, 207178), (142, 145900), (200, 103589), (284, 72950), (355, 58360), (568, 36475), (710, 29180), (1420, 14590), (1459, 14200), (1775, 11672), (2840, 7295), (2918, 7100), (3550, 5836)]