Question

Which number is called as black hole number of math? ​

Answer 1

Answer:

Start with any number greater than one, and write down all its divisors, including 1 and itself. Now take the sum of the digits of these divisors (each individual digit!) Eventually, you get 15, the black hole

Answer 2

Answer:

Start with any number greater than one, and write down all its divisors, including 1 and itself. Now take the sum of the digits of these divisors (each individual digit!) Eventually, you get 15, the black hole.