81209709

素因数分解:

$3^4\times 7^3\times {\mathrm{37}}^1\times {\mathrm{79}}^1$

素因数の和:149

約数の個数: 80

約数和(自身を含む): 147136000

約数和(自身を除く): 65926291

約数列:

[1, 3, 7, 9, 21, 27, 37, 49, 63, 79, 81, 111, 147, 189, 237, 259, 333, 343, 441, 553, 567, 711, 777, 999, 1029, 1323, 1659, 1813, 2133, 2331, 2923, 2997, 3087, 3871, 3969, 4977, 5439, 6399, 6993, 8769, 9261, 11613, 12691, 14931, 16317, 20461, 20979, 26307, 27097, 27783, 34839, 38073, 44793, 48951, 61383, 78921, 81291, 104517, 114219, 143227, 146853, 184149, 236763, 243873, 313551, 342657, 429681, 552447, 731619, 1002589, 1027971, 1289043, 1657341, 2194857, 3007767, 3867129, 9023301, 11601387, 27069903, 81209709]

約数ペア:

[(1, 81209709), (3, 27069903), (7, 11601387), (9, 9023301), (21, 3867129), (27, 3007767), (37, 2194857), (49, 1657341), (63, 1289043), (79, 1027971), (81, 1002589), (111, 731619), (147, 552447), (189, 429681), (237, 342657), (259, 313551), (333, 243873), (343, 236763), (441, 184149), (553, 146853), (567, 143227), (711, 114219), (777, 104517), (999, 81291), (1029, 78921), (1323, 61383), (1659, 48951), (1813, 44793), (2133, 38073), (2331, 34839), (2923, 27783), (2997, 27097), (3087, 26307), (3871, 20979), (3969, 20461), (4977, 16317), (5439, 14931), (6399, 12691), (6993, 11613), (8769, 9261)]