Forgive, has to do only tangentially with language but many wordaphiles are also into math

1. If population doubles in two generations, won't there be about 300 trillion of us (U.S.) in 20 generations or did I slip a decimal point

2. it took approximately 3 million years to reach the present world congestion (at 6 billion estimated to be overpopulated from 5 to 20 times). At the foregoing rate of growth what would world population be in another 3 million years

One of the reasons I am unable to make the calculation myself is that I need it to be expressed not in exponential terms but in in common digits (sepoctillions, quintillions, etc etc) that a typical calculator is simply not equipped to handle

Thanks all

dalehileman