what are the factors of 80

=2 X 2 X 2 X 2  X 5=2^4 X 5

80 can be formed by 1x80, 2x40, 4x20, 5x16, and 8x10, so the factors are 1, 2, 4, 5, 8, 10, 16, 20, 40, 80.