The shape of an egg doesn’t need to be oval. Changing the shape to a long makes in easier to slice the egg in even pieces. That’s why it is called Long Eggs Recipe of course.
You can image how many eggs you will need to get 20 equal egg slices. This video will show you how that can be done.
Here you will see how they are producing it at industrial level and also how you can do it at home.
Video is not on English but you will get the point.