Unusual $20 serial number

I have a $20 bill with the serial number MF 10988887 H. Is it valued much more than $20?

I would say no. If you have binary serial with two digits, low serial, star note, solid radar then yes. I had 1 dollar note with all digits same from 2006 and sold it for around 65 dollars. 

However if you have euro banknote with 6 or 7 same consecutive digits, it would be very sought after