21561650

素因数分解:

$2^1\times 5^2\times {\mathrm{11}}^1\times {\mathrm{197}}^1\times {\mathrm{199}}^1$

素因数の和:419

約数の個数: 48

約数和(自身を含む): 44193600

約数和(自身を除く): 22631950

約数列:

[1, 2, 5, 10, 11, 22, 25, 50, 55, 110, 197, 199, 275, 394, 398, 550, 985, 995, 1970, 1990, 2167, 2189, 4334, 4378, 4925, 4975, 9850, 9950, 10835, 10945, 21670, 21890, 39203, 54175, 54725, 78406, 108350, 109450, 196015, 392030, 431233, 862466, 980075, 1960150, 2156165, 4312330, 10780825, 21561650]

約数ペア:

[(1, 21561650), (2, 10780825), (5, 4312330), (10, 2156165), (11, 1960150), (22, 980075), (25, 862466), (50, 431233), (55, 392030), (110, 196015), (197, 109450), (199, 108350), (275, 78406), (394, 54725), (398, 54175), (550, 39203), (985, 21890), (995, 21670), (1970, 10945), (1990, 10835), (2167, 9950), (2189, 9850), (4334, 4975), (4378, 4925)]