The greatest common factor of 12, 18, 20 and 32 is 2.
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Since 20 is a factor of 40, it is automatically the GCF.
The LCM and GCF of 40 and 20 are 40 and 20 respectively.
The GCF is 5.
The GCF of these numbers is 40.
The GCF of 30 and 20 is 10. The GCF of 40 and 20 is 20.