you have to write an algebraic expression.
your number can be any thing you want... lets call it (q)
the sum means you add the numbers. so...
q + 23
the word (IS) in algebra means equal to so...
q + 23 = 20
so what number added to 23 will equal to 20
the answer is negative 3
q=-3
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23 + 27 = 50
Then the number is 16
No 23 is a prime #
The sum of the prime factors of 6 is closest in value to the composite number 6.
If, "by sum of 23", you mean sum of its digits, then there is no possible answer. 995 or 9095 or 900000000095 etc would all qualify and there is no limit to the number of 0s I can add.