21216951

素因数分解:

$3^3\times 7^3\times {\mathrm{29}}^1\times {\mathrm{79}}^1$

素因数の和:138

約数の個数: 64

約数和(自身を含む): 38400000

約数和(自身を除く): 17183049

約数列:

[1, 3, 7, 9, 21, 27, 29, 49, 63, 79, 87, 147, 189, 203, 237, 261, 343, 441, 553, 609, 711, 783, 1029, 1323, 1421, 1659, 1827, 2133, 2291, 3087, 3871, 4263, 4977, 5481, 6873, 9261, 9947, 11613, 12789, 14931, 16037, 20619, 27097, 29841, 34839, 38367, 48111, 61857, 81291, 89523, 104517, 112259, 144333, 243873, 268569, 336777, 432999, 731619, 785813, 1010331, 2357439, 3030993, 7072317, 21216951]

約数ペア:

[(1, 21216951), (3, 7072317), (7, 3030993), (9, 2357439), (21, 1010331), (27, 785813), (29, 731619), (49, 432999), (63, 336777), (79, 268569), (87, 243873), (147, 144333), (189, 112259), (203, 104517), (237, 89523), (261, 81291), (343, 61857), (441, 48111), (553, 38367), (609, 34839), (711, 29841), (783, 27097), (1029, 20619), (1323, 16037), (1421, 14931), (1659, 12789), (1827, 11613), (2133, 9947), (2291, 9261), (3087, 6873), (3871, 5481), (4263, 4977)]