20720000

素因数分解:

$2^7\times 5^4\times 7^1\times {\mathrm{37}}^1$

素因数の和:78

約数の個数: 160

約数和(自身を含む): 60543120

約数和(自身を除く): 39823120

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 25, 28, 32, 35, 37, 40, 50, 56, 64, 70, 74, 80, 100, 112, 125, 128, 140, 148, 160, 175, 185, 200, 224, 250, 259, 280, 296, 320, 350, 370, 400, 448, 500, 518, 560, 592, 625, 640, 700, 740, 800, 875, 896, 925, 1000, 1036, 1120, 1184, 1250, 1295, 1400, 1480, 1600, 1750, 1850, 2000, 2072, 2240, 2368, 2500, 2590, 2800, 2960, 3200, 3500, 3700, 4000, 4144, 4375, 4480, 4625, 4736, 5000, 5180, 5600, 5920, 6475, 7000, 7400, 8000, 8288, 8750, 9250, 10000, 10360, 11200, 11840, 12950, 14000, 14800, 16000, 16576, 17500, 18500, 20000, 20720, 22400, 23125, 23680, 25900, 28000, 29600, 32375, 33152, 35000, 37000, 40000, 41440, 46250, 51800, 56000, 59200, 64750, 70000, 74000, 80000, 82880, 92500, 103600, 112000, 118400, 129500, 140000, 148000, 161875, 165760, 185000, 207200, 259000, 280000, 296000, 323750, 370000, 414400, 518000, 560000, 592000, 647500, 740000, 828800, 1036000, 1295000, 1480000, 2072000, 2590000, 2960000, 4144000, 5180000, 10360000, 20720000]

約数ペア:

[(1, 20720000), (2, 10360000), (4, 5180000), (5, 4144000), (7, 2960000), (8, 2590000), (10, 2072000), (14, 1480000), (16, 1295000), (20, 1036000), (25, 828800), (28, 740000), (32, 647500), (35, 592000), (37, 560000), (40, 518000), (50, 414400), (56, 370000), (64, 323750), (70, 296000), (74, 280000), (80, 259000), (100, 207200), (112, 185000), (125, 165760), (128, 161875), (140, 148000), (148, 140000), (160, 129500), (175, 118400), (185, 112000), (200, 103600), (224, 92500), (250, 82880), (259, 80000), (280, 74000), (296, 70000), (320, 64750), (350, 59200), (370, 56000), (400, 51800), (448, 46250), (500, 41440), (518, 40000), (560, 37000), (592, 35000), (625, 33152), (640, 32375), (700, 29600), (740, 28000), (800, 25900), (875, 23680), (896, 23125), (925, 22400), (1000, 20720), (1036, 20000), (1120, 18500), (1184, 17500), (1250, 16576), (1295, 16000), (1400, 14800), (1480, 14000), (1600, 12950), (1750, 11840), (1850, 11200), (2000, 10360), (2072, 10000), (2240, 9250), (2368, 8750), (2500, 8288), (2590, 8000), (2800, 7400), (2960, 7000), (3200, 6475), (3500, 5920), (3700, 5600), (4000, 5180), (4144, 5000), (4375, 4736), (4480, 4625)]