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11
The factors of 21 are 1, 3, 7 and 21. No two of them add up to 21.
20
1 and 1090
The two consecutive numbers which when added equal 59 are 29 and 30.
the two factors that equal are 155 *2 by ivelisse cruz in 6th grade 2012
127
two prime numbers when added together will equal 63: 2 + 61
If a number has equal factors, it is a perfect square and the equal factors would be square roots.
A two digit number whose two digits added together equal 42 and multiplied together equal 82
Two (or four) digits added together cannot equal 42. Two-digit numbers multiplied together cannot equal 82.