I wonder how an American pronounces…
We say: twenty /ˈtwɛ-niy/
We don’t pronounce the t at all.
The pronunciation of numbers is very important.
The difference between $14 and $40, for example, is important.
We say numbers 13-19 with a /t/.
We say numbers 30-90 with a /d/.
Here’s a video to practice pronunciation of numbers.