20648240

素因数分解:

$2^4\times 5^1\times {\mathrm{199}}^1\times {\mathrm{1297}}^1$

素因数の和:1509

約数の個数: 40

約数和(自身を含む): 48285600

約数和(自身を除く): 27637360

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 199, 398, 796, 995, 1297, 1592, 1990, 2594, 3184, 3980, 5188, 6485, 7960, 10376, 12970, 15920, 20752, 25940, 51880, 103760, 258103, 516206, 1032412, 1290515, 2064824, 2581030, 4129648, 5162060, 10324120, 20648240]

約数ペア:

[(1, 20648240), (2, 10324120), (4, 5162060), (5, 4129648), (8, 2581030), (10, 2064824), (16, 1290515), (20, 1032412), (40, 516206), (80, 258103), (199, 103760), (398, 51880), (796, 25940), (995, 20752), (1297, 15920), (1592, 12970), (1990, 10376), (2594, 7960), (3184, 6485), (3980, 5188)]