If we had 16
fingers by nature would our natural number system properly be
based @16
instead of 10.

Computers would still use the
binary system for sure - but the conversion between binary and
hexadecimal numbers (with radix 16) very easy compared with
binary to decimal conversions and vice versa.

Please note! - 8 fingers (4 @
each hand) would also be a nice number - but don't even think about it ;-)