What is the purpose of the tiny yellow numbers on the back of a $20 bill? - Quora
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Answer (1 of 3): The number “20” on the back of a twenty dollar bill is part of the anti-duplication or anti-counterfeiting methods employed as well as identifies the denomination of the bill it’s on. Note other bills, ie: $10 bill has the same but only on the right side (looking at the back). Th