How many $20 bills make $1000?

I'm curious about something, could you possibly assist me with a simple calculation? It's been baffling me for quite some time. How exactly do we arrive at the total of $1000 if we start with $20 bills? I'm trying to visualize the process in my mind, but it's not quite clicking for me. Could you break it down step by step? I'm interested in understanding how many of these $20 bills it takes to reach that grand sum of $1000. Your explanation would be greatly appreciated, thank you in advance for your help!