21978999

素因数分解:

$3^3\times 7^2\times {\mathrm{37}}^1\times {\mathrm{449}}^1$

素因数の和:509

約数の個数: 48

約数和(自身を含む): 38988000

約数和(自身を除く): 17009001

約数列:

[1, 3, 7, 9, 21, 27, 37, 49, 63, 111, 147, 189, 259, 333, 441, 449, 777, 999, 1323, 1347, 1813, 2331, 3143, 4041, 5439, 6993, 9429, 12123, 16317, 16613, 22001, 28287, 48951, 49839, 66003, 84861, 116291, 149517, 198009, 348873, 448551, 594027, 814037, 1046619, 2442111, 3139857, 7326333, 21978999]

約数ペア:

[(1, 21978999), (3, 7326333), (7, 3139857), (9, 2442111), (21, 1046619), (27, 814037), (37, 594027), (49, 448551), (63, 348873), (111, 198009), (147, 149517), (189, 116291), (259, 84861), (333, 66003), (441, 49839), (449, 48951), (777, 28287), (999, 22001), (1323, 16613), (1347, 16317), (1813, 12123), (2331, 9429), (3143, 6993), (4041, 5439)]