21051520

素因数分解:

$2^7\times 5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{127}}^1$

素因数の和:190

約数の個数: 128

約数和(自身を含む): 59535360

約数和(自身を除く): 38483840

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 37, 40, 56, 64, 70, 74, 80, 112, 127, 128, 140, 148, 160, 185, 224, 254, 259, 280, 296, 320, 370, 448, 508, 518, 560, 592, 635, 640, 740, 889, 896, 1016, 1036, 1120, 1184, 1270, 1295, 1480, 1778, 2032, 2072, 2240, 2368, 2540, 2590, 2960, 3556, 4064, 4144, 4445, 4480, 4699, 4736, 5080, 5180, 5920, 7112, 8128, 8288, 8890, 9398, 10160, 10360, 11840, 14224, 16256, 16576, 17780, 18796, 20320, 20720, 23495, 23680, 28448, 32893, 33152, 35560, 37592, 40640, 41440, 46990, 56896, 65786, 71120, 75184, 81280, 82880, 93980, 113792, 131572, 142240, 150368, 164465, 165760, 187960, 263144, 284480, 300736, 328930, 375920, 526288, 568960, 601472, 657860, 751840, 1052576, 1315720, 1503680, 2105152, 2631440, 3007360, 4210304, 5262880, 10525760, 21051520]

約数ペア:

[(1, 21051520), (2, 10525760), (4, 5262880), (5, 4210304), (7, 3007360), (8, 2631440), (10, 2105152), (14, 1503680), (16, 1315720), (20, 1052576), (28, 751840), (32, 657860), (35, 601472), (37, 568960), (40, 526288), (56, 375920), (64, 328930), (70, 300736), (74, 284480), (80, 263144), (112, 187960), (127, 165760), (128, 164465), (140, 150368), (148, 142240), (160, 131572), (185, 113792), (224, 93980), (254, 82880), (259, 81280), (280, 75184), (296, 71120), (320, 65786), (370, 56896), (448, 46990), (508, 41440), (518, 40640), (560, 37592), (592, 35560), (635, 33152), (640, 32893), (740, 28448), (889, 23680), (896, 23495), (1016, 20720), (1036, 20320), (1120, 18796), (1184, 17780), (1270, 16576), (1295, 16256), (1480, 14224), (1778, 11840), (2032, 10360), (2072, 10160), (2240, 9398), (2368, 8890), (2540, 8288), (2590, 8128), (2960, 7112), (3556, 5920), (4064, 5180), (4144, 5080), (4445, 4736), (4480, 4699)]