20520880

素因数分解:

$2^4\times 5^1\times {\mathrm{199}}^1\times {\mathrm{1289}}^1$

素因数の和:1501

約数の個数: 40

約数和(自身を含む): 47988000

約数和(自身を除く): 27467120

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 199, 398, 796, 995, 1289, 1592, 1990, 2578, 3184, 3980, 5156, 6445, 7960, 10312, 12890, 15920, 20624, 25780, 51560, 103120, 256511, 513022, 1026044, 1282555, 2052088, 2565110, 4104176, 5130220, 10260440, 20520880]

約数ペア:

[(1, 20520880), (2, 10260440), (4, 5130220), (5, 4104176), (8, 2565110), (10, 2052088), (16, 1282555), (20, 1026044), (40, 513022), (80, 256511), (199, 103120), (398, 51560), (796, 25780), (995, 20624), (1289, 15920), (1592, 12890), (1990, 10312), (2578, 7960), (3184, 6445), (3980, 5156)]