It's a Heptagon
It is worth 20p.
Britain introduced a 20p coin on 9 June 1982.
A 20p coin weighs approximately 5 grams.
1982
eBay
It's a rare coin You collect them
One 20p coin and one 5p coin.
A 20p coin has a total of 6 sides: one for each of the two faces (obverse and reverse) and the four edges. The term "SIDS" typically refers to "sides," so in this context, a 20p coin can be said to have 6 sides.
In British coinage the denominations lower than the 20p coin are the 10p, 5p, 2p, and 1p coins. There was also a half penny coin but this was withdrawn from circulation in 1984.
The volume of a 20p coin, which is a British coin, is approximately 3.5 cubic centimeters (cm³). This volume is derived from its dimensions: it has a diameter of 21.4 mm and a thickness of 1.7 mm. The coin is made of nickel-brass, contributing to its overall weight and volume.
The 2008 mule 20p is more valuable than other 20p coins because it is uncommon and desirable to collectors. If the United Kingdom switched to the Euro this would not change the value of the coin as a collectors item, in fact it would probably make the coin slightly more desirable.
Each 20p coin weighs 5 grams... Therefore - there would be 3632 coins (valued at 726.40)