21391587

素因数分解:

$3^3\times 7^2\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1$

素因数の和:102

約数の個数: 96

約数和(自身を含む): 41587200

約数和(自身を除く): 20195613

約数列:

[1, 3, 7, 9, 19, 21, 23, 27, 37, 49, 57, 63, 69, 111, 133, 147, 161, 171, 189, 207, 259, 333, 399, 437, 441, 483, 513, 621, 703, 777, 851, 931, 999, 1127, 1197, 1311, 1323, 1449, 1813, 2109, 2331, 2553, 2793, 3059, 3381, 3591, 3933, 4347, 4921, 5439, 5957, 6327, 6993, 7659, 8379, 9177, 10143, 11799, 14763, 16169, 16317, 17871, 18981, 21413, 22977, 25137, 27531, 30429, 34447, 41699, 44289, 48507, 48951, 53613, 64239, 82593, 103341, 113183, 125097, 132867, 145521, 160839, 192717, 310023, 339549, 375291, 436563, 578151, 792281, 930069, 1018647, 1125873, 2376843, 3055941, 7130529, 21391587]

約数ペア:

[(1, 21391587), (3, 7130529), (7, 3055941), (9, 2376843), (19, 1125873), (21, 1018647), (23, 930069), (27, 792281), (37, 578151), (49, 436563), (57, 375291), (63, 339549), (69, 310023), (111, 192717), (133, 160839), (147, 145521), (161, 132867), (171, 125097), (189, 113183), (207, 103341), (259, 82593), (333, 64239), (399, 53613), (437, 48951), (441, 48507), (483, 44289), (513, 41699), (621, 34447), (703, 30429), (777, 27531), (851, 25137), (931, 22977), (999, 21413), (1127, 18981), (1197, 17871), (1311, 16317), (1323, 16169), (1449, 14763), (1813, 11799), (2109, 10143), (2331, 9177), (2553, 8379), (2793, 7659), (3059, 6993), (3381, 6327), (3591, 5957), (3933, 5439), (4347, 4921)]