20
This is addition (+) which adds two numbers.
36
This is subraction (-)which substracts the second number from the first number.
2403
This is multiplication (*) which multiplies two numbers.
1.2727272727273
This is the division(/) which dives the first number by the second number.
3
This is the modulus (%) which returns the remainder of the division of the first number by the second number.