1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, 1000.
1 and 19.
These numbers divide evenly into 223,127: 1, 43, 5189, 223127
The numbers 1, 3, 29 and 87 will divide 87 evenly.
Because they both will divide into 1000 evenly with no remainders
The largest number that will divide evenly into all the members of a given set of numbers.