[Paal Gulli]

It all depends on how loosely (or precisely) you define "a computer."

The abacus, the astrolabe, and the Antikythera mechanism all predate the Incan device by several centuries.

And men have counted on their fingers since Adam & Eve. Sumerians and Babylonians did arithmetic in sexagesimal (base 60) by using the five fingers on one hand to count the 12 joints on the other (which is why the metric system can't get rid of the 60-minute hour and the 60-second minute).

So it all depends on wherre you stick the pin and say this is a computer.

[Paal Gulli]

"...(which is why the metric system can't get rid of the 60-minute hour and the 60-second minute)...."

...as well as why there are 12 hours in each half-day (and 24 hours in a whole one).

[Blennos]

The Greek Antikythera device is over 2000 years old.

https://www.britannica.com/topic/Antikythera-mechanism