The only common factor is 1.
21 has the most factors of the four numbers. 19 has 2 factors (1 and 19) 21 has 4 factors (1, 3, 7, 21) 23 has 2 factors (1, 23) 25 has 3 factors (1, 5, 25)
19 is a prime number. Its only factors are 1 and 19. 21 is a composite number. Its factors are 1, 3, 7, and 21. 23 is a prime number. Its only factors are 1 and 23.
Out of that group, 21 has the most factors.
which of the numbers 19 21 23 and 25 has the most factors
21
21 has the most factors of the given numbers.
Both 1 and 19 can divide into both 19 and 57.
The greatest common factor of 21 and 39 is 3
21 does.
The number 21 would be the answer. 19 and 23 only have two factors, 1 and themselves, as they are prime numbers. 25 only has 1, 25 and 5. 21 has 1, 21, 3 and 7 for 4 possible factors.
1,3,7,21 1,19 1,2,5,10,25,50
There is only one and it is 1