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To get the Greates Common Factor (GCF) of 1860 and 169604 we need to factor each value first and then we choose all the copies of factors and multiply them:
|1860: ||2||2||3||5||31|| || |
|169604: ||2||2|| || || ||109||389|
|GCF: ||2||2|| || || || || |
The Greates Common Factor (GCF) is: 2 x 2 = 4