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Assuming you mean factors and not prime factors, one method if the number is not very large (i.e. no more than about 1000), is to first find the square root of the number in question. Then divide the number by each number from 2 (since everything divides by 1) up to and including the square root but NOT over. Each time you get a whole number, the number you divided by and the whole number are 2 factors.
For example, take 960.
The square root is 30.98, therefore, we only go up to 30, since 31 is greater than the square root.
960 / 2 = 480
960 / 3 = 320
960 / 4 = 240
960 / 5 = 192
960 / 6 = 160
960 / 7 = 137.1429
960 / 8 = 120
960 / 9 = 106.6667
960 / 10 = 96
960 / 11 = 87.27273
960 / 12 = 80
960 / 13 = 73.84615
960 / 14 = 68.57143
960 / 15 = 64
960 / 16 = 60
960 / 17 = 56.47059
960 / 18 = 53.33333
960 / 19 = 50.52632
960 / 20 = 48
960 / 21 = 45.71429
960 / 22 = 43.63636
960 / 23 = 41.73913
960 / 24 = 40
960 / 25 = 38.4
960 / 26 = 36.92308
960 / 27 = 35.55556
960 / 28 = 34.28571
960 / 29 = 33.10345
960 / 30 = 32
From this list, we see that the only denominators that divide into 960 equally are 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24 and 30.
These are all factors of 960. The resulting quotients from dividing 960 into these factors will also be factors.
They can either be listed in pairs, or in ascending order. If you list them in ascending order, the denominators will be listed as above, but the quotients would be listed backwards. I.e. you'd do the result of 960 / 30, then 960 / 24, etc. Therefore, the factors if 960 are:
2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 48, 60, 64, 80, 96, 120, 160, 192, 240, 320, and 480. You can also count 1, and 960 as being factors of 960.
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