It's not glue or gunk it's metal and the number 20 that you See is raised and in the right sequence. I guess I'll get out the microscope take couple pictures that way.
I don't see a number 20, but the date (2000) is partially obscured by the blob. The blob is clearly a contaminant of some kind that got stuck to the coin after minting; it's produced a stain in a circle around it. It is not an error. It's possibly solder or something.
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