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| 20900: | 2 | 2 | 5 | 5 | 11 | 19 | |
| 18700: | 2 | 2 | 5 | 5 | 11 | 17 | |
| GCF: | 2 | 2 | 5 | 5 | 11 |
The Greates Common Factor (GCF) is: 2 x 2 x 5 x 5 x 11 = 1100
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