The number 20 in binary is 10100
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No - the eight-bit binary code for 53 is 00110101 - if counting the binary number, when increasing the powers of two which you add together, you have written the indices at the top of the column in the wrong direction - it is the rightmost digit which starts at 20, increasing to 21, 22, 23, etc...
The sum of binary numbers is also a binary number.
1102 = 1*22 + 1*21 + 0*20 = 4 + 2 + 0 = 6