18999981

素因数分解:

$3^3\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1$

素因数の和:96

約数の個数: 128

約数和(自身を含む): 40857600

約数和(自身を除く): 21857619

約数列:

[1, 3, 7, 9, 11, 13, 19, 21, 27, 33, 37, 39, 57, 63, 77, 91, 99, 111, 117, 133, 143, 171, 189, 209, 231, 247, 259, 273, 297, 333, 351, 399, 407, 429, 481, 513, 627, 693, 703, 741, 777, 819, 999, 1001, 1197, 1221, 1287, 1443, 1463, 1729, 1881, 2079, 2109, 2223, 2331, 2457, 2717, 2849, 3003, 3367, 3591, 3663, 3861, 4329, 4389, 4921, 5187, 5291, 5643, 6327, 6669, 6993, 7733, 8151, 8547, 9009, 9139, 10101, 10989, 12987, 13167, 14763, 15561, 15873, 18981, 19019, 23199, 24453, 25641, 27027, 27417, 30303, 37037, 39501, 44289, 46683, 47619, 54131, 57057, 63973, 69597, 73359, 76923, 82251, 90909, 100529, 111111, 132867, 142857, 162393, 171171, 191919, 208791, 246753, 301587, 333333, 487179, 513513, 575757, 703703, 904761, 999999, 1461537, 1727271, 2111109, 2714283, 6333327, 18999981]

約数ペア:

[(1, 18999981), (3, 6333327), (7, 2714283), (9, 2111109), (11, 1727271), (13, 1461537), (19, 999999), (21, 904761), (27, 703703), (33, 575757), (37, 513513), (39, 487179), (57, 333333), (63, 301587), (77, 246753), (91, 208791), (99, 191919), (111, 171171), (117, 162393), (133, 142857), (143, 132867), (171, 111111), (189, 100529), (209, 90909), (231, 82251), (247, 76923), (259, 73359), (273, 69597), (297, 63973), (333, 57057), (351, 54131), (399, 47619), (407, 46683), (429, 44289), (481, 39501), (513, 37037), (627, 30303), (693, 27417), (703, 27027), (741, 25641), (777, 24453), (819, 23199), (999, 19019), (1001, 18981), (1197, 15873), (1221, 15561), (1287, 14763), (1443, 13167), (1463, 12987), (1729, 10989), (1881, 10101), (2079, 9139), (2109, 9009), (2223, 8547), (2331, 8151), (2457, 7733), (2717, 6993), (2849, 6669), (3003, 6327), (3367, 5643), (3591, 5291), (3663, 5187), (3861, 4921), (4329, 4389)]