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The LCM of 27 and 63 is 189. The LCM of 81 and 441 is 3969. The LCM of all four is 3969.
If a number has equal factors, it is a perfect square and the equal factors would be square roots.
The GCF is 1.
Every number is divisible by 21. Any element of the set of numbers of the form 21*k where k is an integer is evenly divisible.
40 and 10