21420693

素因数分解:

$3^5\times 7^3\times {\mathrm{257}}^1$

素因数の和:293

約数の個数: 48

約数和(自身を含む): 37564800

約数和(自身を除く): 16144107

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 81, 147, 189, 243, 257, 343, 441, 567, 771, 1029, 1323, 1701, 1799, 2313, 3087, 3969, 5397, 6939, 9261, 11907, 12593, 16191, 20817, 27783, 37779, 48573, 62451, 83349, 88151, 113337, 145719, 264453, 340011, 437157, 793359, 1020033, 2380077, 3060099, 7140231, 21420693]

約数ペア:

[(1, 21420693), (3, 7140231), (7, 3060099), (9, 2380077), (21, 1020033), (27, 793359), (49, 437157), (63, 340011), (81, 264453), (147, 145719), (189, 113337), (243, 88151), (257, 83349), (343, 62451), (441, 48573), (567, 37779), (771, 27783), (1029, 20817), (1323, 16191), (1701, 12593), (1799, 11907), (2313, 9261), (3087, 6939), (3969, 5397)]