81123456

素因数分解:

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

素因数の和:111

約数の個数: 128

約数和(自身を含む): 234273600

約数和(自身を除く): 153150144

約数列:

[1, 2, 3, 4, 6, 8, 12, 16, 17, 24, 32, 34, 43, 48, 51, 64, 68, 86, 96, 102, 128, 129, 136, 172, 192, 204, 258, 272, 289, 344, 384, 408, 516, 544, 578, 688, 731, 816, 867, 1032, 1088, 1156, 1376, 1462, 1632, 1734, 2064, 2176, 2193, 2312, 2752, 2924, 3264, 3468, 4128, 4386, 4624, 4913, 5504, 5848, 6528, 6936, 8256, 8772, 9248, 9826, 11696, 12427, 13872, 14739, 16512, 17544, 18496, 19652, 23392, 24854, 27744, 29478, 35088, 36992, 37281, 39304, 46784, 49708, 55488, 58956, 70176, 74562, 78608, 93568, 99416, 110976, 117912, 140352, 149124, 157216, 198832, 211259, 235824, 280704, 298248, 314432, 397664, 422518, 471648, 596496, 628864, 633777, 795328, 845036, 943296, 1192992, 1267554, 1590656, 1690072, 1886592, 2385984, 2535108, 3380144, 4771968, 5070216, 6760288, 10140432, 13520576, 20280864, 27041152, 40561728, 81123456]

約数ペア:

[(1, 81123456), (2, 40561728), (3, 27041152), (4, 20280864), (6, 13520576), (8, 10140432), (12, 6760288), (16, 5070216), (17, 4771968), (24, 3380144), (32, 2535108), (34, 2385984), (43, 1886592), (48, 1690072), (51, 1590656), (64, 1267554), (68, 1192992), (86, 943296), (96, 845036), (102, 795328), (128, 633777), (129, 628864), (136, 596496), (172, 471648), (192, 422518), (204, 397664), (258, 314432), (272, 298248), (289, 280704), (344, 235824), (384, 211259), (408, 198832), (516, 157216), (544, 149124), (578, 140352), (688, 117912), (731, 110976), (816, 99416), (867, 93568), (1032, 78608), (1088, 74562), (1156, 70176), (1376, 58956), (1462, 55488), (1632, 49708), (1734, 46784), (2064, 39304), (2176, 37281), (2193, 36992), (2312, 35088), (2752, 29478), (2924, 27744), (3264, 24854), (3468, 23392), (4128, 19652), (4386, 18496), (4624, 17544), (4913, 16512), (5504, 14739), (5848, 13872), (6528, 12427), (6936, 11696), (8256, 9826), (8772, 9248)]