Imagine how boss a culture would be being able to count up to 31 on a single hand, and 1023 with two hands.

I can do it but I have to hold down the other fingers with my thumb or by pinching them into the palm of my hand.

Bend them the other way. Start with all fingers open for zero, and curl them as needed. You only need to move them a bit, so even twenty (thumb and ring finger back, the others curled) isn't too hard.

Try bending at the first finger joints instead of at the knuckles.

you can cheat it quite easily, just hover your hand over a table or surface, and touch your fingers to the surface to indicate a 1, and dont to indicate a zero, works on your leg, or someone elses, if you felt like it i guess.

Flip your hand around

Then its a different finger

Well at that point you can also draw any number in air, no?

Or you could just use the 10 fingers, 2^10 is 1024, so you can count from 0 to 1023

Up to 1023 if you use binary!

I was able to get to this number: 1 048 576 by using base 4 and making each finger a different "10" s place using each finger segment and the tip of the palm below it but you have to keep track of how many of each order of magnitude you have by yourself. Alternatively, just use a piece of paper.