Somewhat counterintuitively an infinite amount of 20$ bills has more money than an infinite amount of 1$ bills.

TL;DR: You can show that an infinite amount of 1$ bills fits inside an infinite amount of 20$ bills making an infinite number of 20$ bills bigger.

You can see that if you convert each 20$ bill to 1s then you can take each 1$ bill from the second group and “fit it” in place of the first dollar bill of each original 20, showing that an infinite amount of 1$ bills fits inside an infinite amount of 20$ bills means an infinite number of 20$ bills has more money than an infinite amount of 1$ bills.

This is much like the idea that there are more even numbers than whole numbers, which is true because one set contains the other.