220

There are exactly 220 s in a .
It is also approximately the number of imperial s in a .
Furthermore, it is the in many countries.
Since it is the 10th tetrahedral number, where 10 is the 3rd tetrahedral number, it also appears in the calculation of the tetrahedroogol.
Finally, it is part of the smallest (namely, with 284).
== In chess ==
It is also the number of possible bishop moves in 6×6 minichess.
Category:Numbers
Category:Chess
Category:Class 1
Category:Even numbers
Category:Non-powers
Category:Numbers in engineering
Category:Numbers in metrology
Category:Numbers with 3 digits
Category:Unnamed numbers with googological uses