18978003

素因数分解:

$3^3\times {\mathrm{11}}^2\times {\mathrm{37}}^1\times {\mathrm{157}}^1$

素因数の和:225

約数の個数: 48

約数和(自身を含む): 31941280

約数和(自身を除く): 12963277

約数列:

[1, 3, 9, 11, 27, 33, 37, 99, 111, 121, 157, 297, 333, 363, 407, 471, 999, 1089, 1221, 1413, 1727, 3267, 3663, 4239, 4477, 5181, 5809, 10989, 13431, 15543, 17427, 18997, 40293, 46629, 52281, 56991, 63899, 120879, 156843, 170973, 191697, 512919, 575091, 702889, 1725273, 2108667, 6326001, 18978003]

約数ペア:

[(1, 18978003), (3, 6326001), (9, 2108667), (11, 1725273), (27, 702889), (33, 575091), (37, 512919), (99, 191697), (111, 170973), (121, 156843), (157, 120879), (297, 63899), (333, 56991), (363, 52281), (407, 46629), (471, 40293), (999, 18997), (1089, 17427), (1221, 15543), (1413, 13431), (1727, 10989), (3267, 5809), (3663, 5181), (4239, 4477)]