Yes, if a number is divisible by 20, then it is also an even number. This is because any number that is divisible by 20 must also be divisible by 2, as 20 is a multiple of 2. Since even numbers are multiples of 2, any number divisible by 20 will be a multiple of 2 and therefore even.
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Formula for even sided shapes: Number of sides divided by 2. 20 divided by two equals 10.
Pi is an irrational number, meaning it cannot be expressed as a simple fraction. As such, pi cannot be divided evenly by any non-zero integer, including itself. In other words, pi is not divisible by any whole number.
There is no limit to the number of sides that a particular shape can have. The Icosahedron has 20 sides. It would tend to the circle as the number tends to infinity: even a 360-sided polygon (1 degree internal angles) would look a bit like like a pixellated circle.