20 divided by 4 equals 5. To understand this, you can think of division as splitting a number into equal parts. If you take 20 and divide it into 4 equal groups, each group will contain 5. You can also check this by multiplying: if you multiply 5 (the result) by 4 (the divisor), you get back to 20. This simple division illustrates how many times 4 can fit into 20, which is exactly 5 times.