I need to convert a number in the log2 scale (4.6), to the natural scale.

Using ‘Rmpfr’ in this example (text doesn’t work as there is no way to input my data as base = (natural log). I cannot see any other packages that will allow me to do this. I wonder what it is I am missing. Apologies if this is a very simple question; I’m very new to quantitative research.