What year was it 620 centuries ago?

Answer 1

A century is 100 years.

620centuries * 100 years/century = 62,000 years

Given that the year as of this writing is 2011, we have

62,000 - 2011 = 59089

However, remember that the Gregorian Calendar starts at year 1 - there is no year 0. So we must add an extra year:

59089 + 1 = 59090 B.C.

or 59090 B.C.E. if you prefer.