Factor of 1:1;

Factor 2: 1, 2;

Factor of 3: 1, 3;

Factors of 4: 1, 2, 4;

Factor 5: 1, 5;

Factor of 6: 1, 2, 3, 6;

Factor of 7: 1, 7;

Factor of 8: 1, 2, 4, 8;

Factor of 9: 1, 3, 9;

10 factor: 1, 2,5,10;

1 1 Factor: 1,1;

12 factors: 1, 2, 3, 4, 6,12;

13 factor: 1,13;

14 factor: 1, 2,7,14;

15 factor: 1, 3,5,15;

16 factors: 1, 2, 4, 8,16;

17 factor: 1,17;

18 factors: 1, 2, 3, 6, 9,18;

19 factor: 1,19;

Factor of 20: 1, 2, 4, 5, 10, 20;

Factor 2 1: 1, 3,7,21;

Factor of 22: 1, 2, 1 1, 22;

Factor of 23: 1, 23;

Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24;

Factor of 25: 1, 5, 25;

Factor of 26: 1, 2, 13, 26;

Factor of 27: 1, 3, 9, 27;

Factor of 28: 1, 2, 4, 7, 14, 28;

Factor of 29: 1, 29;

Factor of 30: 1, 2, 3, 5, 6, 10, 15, 30;

Extended data:

If a*b=c(a, B and C are all integers), then we call A and B factors of C. It should be noted that this relationship only holds when the dividend, divisor and quotient are integers and the remainder is zero. On the contrary, we call c a multiple of a and b, and we don't consider 0 when studying factors and multiples.

In primary school mathematics, two positive integers are multiplied, so both numbers are called factors of product, or divisors.

In fact, factors are generally defined as integers: let a be an integer and b be a non-zero integer. If there is an integer Q that makes A=QB, then B is a factor of A, denoted as B | A ... but some authors do not require B≠0.

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