What is the inverse operation of division of integers?

Inverse of division is MULTIPLICATION .

Conversely , the inverse of multiplication is division.

e.g.

20/4 = 5

but 5 x 4 = 20

Similarly Inverse of subtraction is ADDITION .

Conversely , the inverse of addition is subtraction.

e.g.

5 - 3 = 2

but 3 + 2 = 5