20728880

素因数分解:

$2^4\times 5^1\times {\mathrm{37}}^1\times {\mathrm{47}}^1\times {\mathrm{149}}^1$

素因数の和:246

約数の個数: 80

約数和(自身を含む): 50889600

約数和(自身を除く): 30160720

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 37, 40, 47, 74, 80, 94, 148, 149, 185, 188, 235, 296, 298, 370, 376, 470, 592, 596, 740, 745, 752, 940, 1192, 1480, 1490, 1739, 1880, 2384, 2960, 2980, 3478, 3760, 5513, 5960, 6956, 7003, 8695, 11026, 11920, 13912, 14006, 17390, 22052, 27565, 27824, 28012, 34780, 35015, 44104, 55130, 56024, 69560, 70030, 88208, 110260, 112048, 139120, 140060, 220520, 259111, 280120, 441040, 518222, 560240, 1036444, 1295555, 2072888, 2591110, 4145776, 5182220, 10364440, 20728880]

約数ペア:

[(1, 20728880), (2, 10364440), (4, 5182220), (5, 4145776), (8, 2591110), (10, 2072888), (16, 1295555), (20, 1036444), (37, 560240), (40, 518222), (47, 441040), (74, 280120), (80, 259111), (94, 220520), (148, 140060), (149, 139120), (185, 112048), (188, 110260), (235, 88208), (296, 70030), (298, 69560), (370, 56024), (376, 55130), (470, 44104), (592, 35015), (596, 34780), (740, 28012), (745, 27824), (752, 27565), (940, 22052), (1192, 17390), (1480, 14006), (1490, 13912), (1739, 11920), (1880, 11026), (2384, 8695), (2960, 7003), (2980, 6956), (3478, 5960), (3760, 5513)]