The Number 1420
Prime Factors of 1420=2x2x5x71.
1420 is a 238-gonal Number.
The Year 1420 AD
In the year 1420 oil painting was invented.
In the year 1420 Ulugh Beg, noted astronomer, had an observatory built at Samarkand in central Asia. The observatory was a 3-story building, but also contained instruments that were outdoors.