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Rational?
Compatible numbers can easily be divided mentally.
The term that describes numbers that are easy to compute mentally is "round numbers." Round numbers are whole numbers that end in zero or five, making them simpler to work with in mental calculations. These numbers are often used in estimation and quick arithmetic tasks due to their ease of manipulation.
There is no such word since the ease of division depends on how well you know your times tables, how well you know your divisibility rules as well as how good you are at recognising patterns.
Your brain, of course.