21691000

素因数分解:

$2^3\times 5^3\times {\mathrm{109}}^1\times {\mathrm{199}}^1$

素因数の和:329

約数の個数: 64

約数和(自身を含む): 51480000

約数和(自身を除く): 29789000

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 109, 125, 199, 200, 218, 250, 398, 436, 500, 545, 796, 872, 995, 1000, 1090, 1592, 1990, 2180, 2725, 3980, 4360, 4975, 5450, 7960, 9950, 10900, 13625, 19900, 21691, 21800, 24875, 27250, 39800, 43382, 49750, 54500, 86764, 99500, 108455, 109000, 173528, 199000, 216910, 433820, 542275, 867640, 1084550, 2169100, 2711375, 4338200, 5422750, 10845500, 21691000]

約数ペア:

[(1, 21691000), (2, 10845500), (4, 5422750), (5, 4338200), (8, 2711375), (10, 2169100), (20, 1084550), (25, 867640), (40, 542275), (50, 433820), (100, 216910), (109, 199000), (125, 173528), (199, 109000), (200, 108455), (218, 99500), (250, 86764), (398, 54500), (436, 49750), (500, 43382), (545, 39800), (796, 27250), (872, 24875), (995, 21800), (1000, 21691), (1090, 19900), (1592, 13625), (1990, 10900), (2180, 9950), (2725, 7960), (3980, 5450), (4360, 4975)]