0
Your question makes no sense.
Edit: My answer was a bit harsh. I presume you're talking about a lowest common denominator (LCD). Without both the numerator, and the dividend, there's no way to find out what the "least number" is. You need to provide both to have an answer. For example, the "least number" for 10/2000000 is 1/200000. The "least number" for 2/2000000 is 1/1000000.
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