21245784

素因数分解:

$2^3\times 3^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{173}}^1$

素因数の和:249

約数の個数: 128

約数和(自身を含む): 66147840

約数和(自身を除く): 44902056

約数列:

[1, 2, 3, 4, 6, 7, 8, 12, 14, 17, 21, 24, 28, 34, 42, 43, 51, 56, 68, 84, 86, 102, 119, 129, 136, 168, 172, 173, 204, 238, 258, 301, 344, 346, 357, 408, 476, 516, 519, 602, 692, 714, 731, 903, 952, 1032, 1038, 1204, 1211, 1384, 1428, 1462, 1806, 2076, 2193, 2408, 2422, 2856, 2924, 2941, 3612, 3633, 4152, 4386, 4844, 5117, 5848, 5882, 7224, 7266, 7439, 8772, 8823, 9688, 10234, 11764, 14532, 14878, 15351, 17544, 17646, 20468, 20587, 22317, 23528, 29064, 29756, 30702, 35292, 40936, 41174, 44634, 52073, 59512, 61404, 61761, 70584, 82348, 89268, 104146, 122808, 123522, 126463, 156219, 164696, 178536, 208292, 247044, 252926, 312438, 379389, 416584, 494088, 505852, 624876, 758778, 885241, 1011704, 1249752, 1517556, 1770482, 2655723, 3035112, 3540964, 5311446, 7081928, 10622892, 21245784]

約数ペア:

[(1, 21245784), (2, 10622892), (3, 7081928), (4, 5311446), (6, 3540964), (7, 3035112), (8, 2655723), (12, 1770482), (14, 1517556), (17, 1249752), (21, 1011704), (24, 885241), (28, 758778), (34, 624876), (42, 505852), (43, 494088), (51, 416584), (56, 379389), (68, 312438), (84, 252926), (86, 247044), (102, 208292), (119, 178536), (129, 164696), (136, 156219), (168, 126463), (172, 123522), (173, 122808), (204, 104146), (238, 89268), (258, 82348), (301, 70584), (344, 61761), (346, 61404), (357, 59512), (408, 52073), (476, 44634), (516, 41174), (519, 40936), (602, 35292), (692, 30702), (714, 29756), (731, 29064), (903, 23528), (952, 22317), (1032, 20587), (1038, 20468), (1204, 17646), (1211, 17544), (1384, 15351), (1428, 14878), (1462, 14532), (1806, 11764), (2076, 10234), (2193, 9688), (2408, 8823), (2422, 8772), (2856, 7439), (2924, 7266), (2941, 7224), (3612, 5882), (3633, 5848), (4152, 5117), (4386, 4844)]