20781322821

素因数分解:

$3^5\times 7^3\times {\mathrm{249329}}^1$

素因数の和:249365

約数の個数: 48

約数和(自身を含む): 36302448000

約数和(自身を除く): 15521125179

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 81, 147, 189, 243, 343, 441, 567, 1029, 1323, 1701, 3087, 3969, 9261, 11907, 27783, 83349, 249329, 747987, 1745303, 2243961, 5235909, 6731883, 12217121, 15707727, 20195649, 36651363, 47123181, 60586947, 85519847, 109954089, 141369543, 256559541, 329862267, 424108629, 769678623, 989586801, 2309035869, 2968760403, 6927107607, 20781322821]

約数ペア:

[(1, 20781322821), (3, 6927107607), (7, 2968760403), (9, 2309035869), (21, 989586801), (27, 769678623), (49, 424108629), (63, 329862267), (81, 256559541), (147, 141369543), (189, 109954089), (243, 85519847), (343, 60586947), (441, 47123181), (567, 36651363), (1029, 20195649), (1323, 15707727), (1701, 12217121), (3087, 6731883), (3969, 5235909), (9261, 2243961), (11907, 1745303), (27783, 747987), (83349, 249329)]