21999978

素因数分解:

$2^1\times 3^3\times 7^1\times {\mathrm{11}}^2\times {\mathrm{13}}^1\times {\mathrm{37}}^1$

素因数の和:90

約数の個数: 192

約数和(自身を含む): 67925760

約数和(自身を除く): 45925782

約数列:

[1, 2, 3, 6, 7, 9, 11, 13, 14, 18, 21, 22, 26, 27, 33, 37, 39, 42, 54, 63, 66, 74, 77, 78, 91, 99, 111, 117, 121, 126, 143, 154, 182, 189, 198, 222, 231, 234, 242, 259, 273, 286, 297, 333, 351, 363, 378, 407, 429, 462, 481, 518, 546, 594, 666, 693, 702, 726, 777, 814, 819, 847, 858, 962, 999, 1001, 1089, 1221, 1287, 1386, 1443, 1554, 1573, 1638, 1694, 1998, 2002, 2079, 2178, 2331, 2442, 2457, 2541, 2574, 2849, 2886, 3003, 3146, 3267, 3367, 3663, 3861, 4158, 4329, 4477, 4662, 4719, 4914, 5082, 5291, 5698, 6006, 6534, 6734, 6993, 7326, 7623, 7722, 8547, 8658, 8954, 9009, 9438, 10101, 10582, 10989, 11011, 12987, 13431, 13986, 14157, 15246, 15873, 17094, 18018, 20202, 21978, 22022, 22869, 25641, 25974, 26862, 27027, 28314, 30303, 31339, 31746, 33033, 37037, 40293, 42471, 45738, 47619, 51282, 54054, 58201, 60606, 62678, 66066, 74074, 76923, 80586, 84942, 90909, 94017, 95238, 99099, 111111, 116402, 120879, 142857, 153846, 174603, 181818, 188034, 198198, 222222, 241758, 282051, 285714, 297297, 333333, 349206, 407407, 523809, 564102, 594594, 666666, 814814, 846153, 999999, 1047618, 1222221, 1571427, 1692306, 1999998, 2444442, 3142854, 3666663, 7333326, 10999989, 21999978]

約数ペア:

[(1, 21999978), (2, 10999989), (3, 7333326), (6, 3666663), (7, 3142854), (9, 2444442), (11, 1999998), (13, 1692306), (14, 1571427), (18, 1222221), (21, 1047618), (22, 999999), (26, 846153), (27, 814814), (33, 666666), (37, 594594), (39, 564102), (42, 523809), (54, 407407), (63, 349206), (66, 333333), (74, 297297), (77, 285714), (78, 282051), (91, 241758), (99, 222222), (111, 198198), (117, 188034), (121, 181818), (126, 174603), (143, 153846), (154, 142857), (182, 120879), (189, 116402), (198, 111111), (222, 99099), (231, 95238), (234, 94017), (242, 90909), (259, 84942), (273, 80586), (286, 76923), (297, 74074), (333, 66066), (351, 62678), (363, 60606), (378, 58201), (407, 54054), (429, 51282), (462, 47619), (481, 45738), (518, 42471), (546, 40293), (594, 37037), (666, 33033), (693, 31746), (702, 31339), (726, 30303), (777, 28314), (814, 27027), (819, 26862), (847, 25974), (858, 25641), (962, 22869), (999, 22022), (1001, 21978), (1089, 20202), (1221, 18018), (1287, 17094), (1386, 15873), (1443, 15246), (1554, 14157), (1573, 13986), (1638, 13431), (1694, 12987), (1998, 11011), (2002, 10989), (2079, 10582), (2178, 10101), (2331, 9438), (2442, 9009), (2457, 8954), (2541, 8658), (2574, 8547), (2849, 7722), (2886, 7623), (3003, 7326), (3146, 6993), (3267, 6734), (3367, 6534), (3663, 6006), (3861, 5698), (4158, 5291), (4329, 5082), (4477, 4914), (4662, 4719)]