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It is a square number because 20 times 20 = 400
As a product of its prime factors: 2*2*5 = 20 or as 22*5 = 20
20
360
23 - (Parenthesis, Exponents, Division, Multiplication, Addition, Subtraction) The answer would be 23. (do the multiplication first) 4 x 5. (20) then add the three. (20 plus 3 = 23)