1 is their only common factor.
203 is a composite number. Its factors are 1, 7, 29, and 203.
The HCF of 27 and 80 is 1
1
20 is a common factor of 80 and 100.
203 is, itself, a whole number.
203
203
Just the number 1.
1, 2, 4.
1, 2, 4, 8.
1, 2, 4, 8.
1, 2, 4, 8, 16.