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num odd factors
Prime factorize
Add +1 to the exponents of the odd factors
Multiply those odd exponents together
num even factors
Prime factorize
Add +1 to the exponents of the odd factors
Multiply all exponents
Greatest Common Factor
Prime factorize both number
Multiply the factors that they have in common
Least Common Multiple
Prime factorize both number
Take the greatest number of each prime and multiply