19880000

素因数分解:

$2^6\times 5^4\times 7^1\times {\mathrm{71}}^1$

素因数の和:110

約数の個数: 140

約数和(自身を含む): 57131712

約数和(自身を除く): 37251712

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 25, 28, 32, 35, 40, 50, 56, 64, 70, 71, 80, 100, 112, 125, 140, 142, 160, 175, 200, 224, 250, 280, 284, 320, 350, 355, 400, 448, 497, 500, 560, 568, 625, 700, 710, 800, 875, 994, 1000, 1120, 1136, 1250, 1400, 1420, 1600, 1750, 1775, 1988, 2000, 2240, 2272, 2485, 2500, 2800, 2840, 3500, 3550, 3976, 4000, 4375, 4544, 4970, 5000, 5600, 5680, 7000, 7100, 7952, 8000, 8750, 8875, 9940, 10000, 11200, 11360, 12425, 14000, 14200, 15904, 17500, 17750, 19880, 20000, 22720, 24850, 28000, 28400, 31808, 35000, 35500, 39760, 40000, 44375, 49700, 56000, 56800, 62125, 70000, 71000, 79520, 88750, 99400, 113600, 124250, 140000, 142000, 159040, 177500, 198800, 248500, 280000, 284000, 310625, 355000, 397600, 497000, 568000, 621250, 710000, 795200, 994000, 1242500, 1420000, 1988000, 2485000, 2840000, 3976000, 4970000, 9940000, 19880000]

約数ペア:

[(1, 19880000), (2, 9940000), (4, 4970000), (5, 3976000), (7, 2840000), (8, 2485000), (10, 1988000), (14, 1420000), (16, 1242500), (20, 994000), (25, 795200), (28, 710000), (32, 621250), (35, 568000), (40, 497000), (50, 397600), (56, 355000), (64, 310625), (70, 284000), (71, 280000), (80, 248500), (100, 198800), (112, 177500), (125, 159040), (140, 142000), (142, 140000), (160, 124250), (175, 113600), (200, 99400), (224, 88750), (250, 79520), (280, 71000), (284, 70000), (320, 62125), (350, 56800), (355, 56000), (400, 49700), (448, 44375), (497, 40000), (500, 39760), (560, 35500), (568, 35000), (625, 31808), (700, 28400), (710, 28000), (800, 24850), (875, 22720), (994, 20000), (1000, 19880), (1120, 17750), (1136, 17500), (1250, 15904), (1400, 14200), (1420, 14000), (1600, 12425), (1750, 11360), (1775, 11200), (1988, 10000), (2000, 9940), (2240, 8875), (2272, 8750), (2485, 8000), (2500, 7952), (2800, 7100), (2840, 7000), (3500, 5680), (3550, 5600), (3976, 5000), (4000, 4970), (4375, 4544)]