2178981

素因数分解:

$3^6\times 7^2\times {\mathrm{61}}^1$

素因数の和:93

約数の個数: 42

約数和(自身を含む): 3862662

約数和(自身を除く): 1683681

約数列:

[1, 3, 7, 9, 21, 27, 49, 61, 63, 81, 147, 183, 189, 243, 427, 441, 549, 567, 729, 1281, 1323, 1647, 1701, 2989, 3843, 3969, 4941, 5103, 8967, 11529, 11907, 14823, 26901, 34587, 35721, 44469, 80703, 103761, 242109, 311283, 726327, 2178981]

約数ペア:

[(1, 2178981), (3, 726327), (7, 311283), (9, 242109), (21, 103761), (27, 80703), (49, 44469), (61, 35721), (63, 34587), (81, 26901), (147, 14823), (183, 11907), (189, 11529), (243, 8967), (427, 5103), (441, 4941), (549, 3969), (567, 3843), (729, 2989), (1281, 1701), (1323, 1647)]