21177500

素因数分解:

$2^2\times 5^4\times {\mathrm{43}}^1\times {\mathrm{197}}^1$

素因数の和:264

約数の個数: 60

約数和(自身を含む): 47628504

約数和(自身を除く): 26451004

約数列:

[1, 2, 4, 5, 10, 20, 25, 43, 50, 86, 100, 125, 172, 197, 215, 250, 394, 430, 500, 625, 788, 860, 985, 1075, 1250, 1970, 2150, 2500, 3940, 4300, 4925, 5375, 8471, 9850, 10750, 16942, 19700, 21500, 24625, 26875, 33884, 42355, 49250, 53750, 84710, 98500, 107500, 123125, 169420, 211775, 246250, 423550, 492500, 847100, 1058875, 2117750, 4235500, 5294375, 10588750, 21177500]

約数ペア:

[(1, 21177500), (2, 10588750), (4, 5294375), (5, 4235500), (10, 2117750), (20, 1058875), (25, 847100), (43, 492500), (50, 423550), (86, 246250), (100, 211775), (125, 169420), (172, 123125), (197, 107500), (215, 98500), (250, 84710), (394, 53750), (430, 49250), (500, 42355), (625, 33884), (788, 26875), (860, 24625), (985, 21500), (1075, 19700), (1250, 16942), (1970, 10750), (2150, 9850), (2500, 8471), (3940, 5375), (4300, 4925)]