What is the number that is a factor of 18 and a multiple of 3? Urgent ~

What is the number that is a factor of 18 and a multiple of 3? Urgent ~

18: 1,18; 2,9; 3,6;
The multiple of 03: 3; 6; 9; 12; 15; 18;
So the factor of 18 and the multiple of 03 are 3; 6; 9; 18;