21778790

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^2\times {\mathrm{41}}^1\times {\mathrm{439}}^1$

素因数の和:509

約数の個数: 48

約数和(自身を含む): 44241120

約数和(自身を除く): 22462330

約数列:

[1, 2, 5, 10, 11, 22, 41, 55, 82, 110, 121, 205, 242, 410, 439, 451, 605, 878, 902, 1210, 2195, 2255, 4390, 4510, 4829, 4961, 9658, 9922, 17999, 24145, 24805, 35998, 48290, 49610, 53119, 89995, 106238, 179990, 197989, 265595, 395978, 531190, 989945, 1979890, 2177879, 4355758, 10889395, 21778790]

約数ペア:

[(1, 21778790), (2, 10889395), (5, 4355758), (10, 2177879), (11, 1979890), (22, 989945), (41, 531190), (55, 395978), (82, 265595), (110, 197989), (121, 179990), (205, 106238), (242, 89995), (410, 53119), (439, 49610), (451, 48290), (605, 35998), (878, 24805), (902, 24145), (1210, 17999), (2195, 9922), (2255, 9658), (4390, 4961), (4510, 4829)]