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It depends on the number representation you use and how much resolution you need. If you use a floating point representation, the stored number can be extremely large but have poor resolution.

If you need to have a resolution of one count and include a zero, then the largest is 2^20 - 1

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Q: What is the largest unsigned integer that may be stored in 20 bits?
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Related questions

What is the largest positive number that can be stored using 8 bits?

An N-bit integer holds 2N different values.For an unsigned integer, the range of values is 0..2N-1 thus.For a signed integer using 2s complement, the range is -2N-1..+2N-1-1.Therefore, the largest positive number that can be stored using 8 bits is 255.


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