20711920

素因数分解:

$2^4\times 5^1\times {\mathrm{199}}^1\times {\mathrm{1301}}^1$

素因数の和:1513

約数の個数: 40

約数和(自身を含む): 48434400

約数和(自身を除く): 27722480

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 199, 398, 796, 995, 1301, 1592, 1990, 2602, 3184, 3980, 5204, 6505, 7960, 10408, 13010, 15920, 20816, 26020, 52040, 104080, 258899, 517798, 1035596, 1294495, 2071192, 2588990, 4142384, 5177980, 10355960, 20711920]

約数ペア:

[(1, 20711920), (2, 10355960), (4, 5177980), (5, 4142384), (8, 2588990), (10, 2071192), (16, 1294495), (20, 1035596), (40, 517798), (80, 258899), (199, 104080), (398, 52040), (796, 26020), (995, 20816), (1301, 15920), (1592, 13010), (1990, 10408), (2602, 7960), (3184, 6505), (3980, 5204)]