Twentieth, which is the way you have it, is the correct spelling, as in the 20th of January.
The ordinal numeral 20th is spelled twentieth.
The correct spelling is twentieth.An example sentence is "for the twentieth time, spell the word correctly!"
that is the correct way to spell forgery
The correct way to spell "a lot" is "allot."
what is the correct way to spell noticeable
The correct way to spell "councillor" is with two L's.
Pianos is correct.
the the correct way is regally
Eighty-eight.
The correct way to spell it is "knowledge."
that is the right way to spell it
Unveil is the correct way to spell it.