20549720

素因数分解:

$2^3\times 5^1\times {\mathrm{257}}^1\times {\mathrm{1999}}^1$

素因数の和:2267

約数の個数: 32

約数和(自身を含む): 46440000

約数和(自身を除く): 25890280

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 257, 514, 1028, 1285, 1999, 2056, 2570, 3998, 5140, 7996, 9995, 10280, 15992, 19990, 39980, 79960, 513743, 1027486, 2054972, 2568715, 4109944, 5137430, 10274860, 20549720]

約数ペア:

[(1, 20549720), (2, 10274860), (4, 5137430), (5, 4109944), (8, 2568715), (10, 2054972), (20, 1027486), (40, 513743), (257, 79960), (514, 39980), (1028, 19990), (1285, 15992), (1999, 10280), (2056, 9995), (2570, 7996), (3998, 5140)]