20 - ٢٠ - 'ishrun - عشرون. Digit numbers in Arabic are a bit like the conventional ones: ٠, ١, ٢, ٣, ٤, ٥, ٦, ٧, ٨ and ٩. And the writing, to represent more numbers, is the same. For example, the number 21 is written "٢١". So it is with the rest. Explaining the way they are written (عشرون) is more complicated.