216 -1
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The largest positive value that can be stored in 20 bits is calculated using the formula for the maximum value of an unsigned binary number, which is (2^n - 1), where (n) is the number of bits. For 20 bits, this is (2^{20} - 1 = 1,048,576 - 1 = 1,048,575). Therefore, the largest positive value that can be stored in 20 bits is 1,048,575.
If the 8 bits represent a signed number, the range is usually -128 to +127. This is -27 to 27-1.
An 8-bit unsigned integer can represent values ranging from 0 to 255. This is because, with 8 bits, there are (2^8 = 256) possible combinations of binary digits. Therefore, the smallest value is 0 (all bits are 0) and the largest value is 255 (all bits are 1).
signed magnitude
There are 8 bits in a byte, so a two byte integer would be 16 bits. The largest 16 bit integer possible would be 11111111111111112, which is 65535 in base 10.