$20 decillion isn't just more money than exists. The amount of money that exists is a rounding error of a rounding error of a dozen more nested rounding errors compared to $20 decillion. The nominal GDP in 2022 was $100 trillion (and even then, calling this "all the money that exists" is a wonky metric). For comparison, $2 undecillion is only 100x more than $20 decillion. So while looking at this XKCD, just chop off two zeroes from the $2 undecillion figure, and boom.

[–] andrew_bidlaw@sh.itjust.works 12 points 3 days ago

I'd call that imbecillion for they aren't really well in the head. Doubling the price for each day is not a real way you calculate pennies even by russian law, it's a custom decision by a judge to push Google off with a cover of questionable legality.