19724135792 has 40 divisors (see below), whose sum is σ = 38624358240. Its totient is φ = 9756748800.

The previous prime is 19724135789. The next prime is 19724135801. The reversal of 19724135792 is 29753142791.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19724135792.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1855292 + ... + 1865892.

It is an arithmetic number, because the mean of its divisors is an integer number (965608956).

Almost surely, 2^19724135792 is an apocalyptic number.

It is an amenable number.

19724135792 is a deficient number, since it is larger than the sum of its proper divisors (18900222448).

19724135792 is a wasteful number, since it uses less digits than its factorization.

19724135792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11841 (or 11835 counting only the distinct ones).

The product of its digits is 952560, while the sum is 50.

The spelling of 19724135792 in words is "nineteen billion, seven hundred twenty-four million, one hundred thirty-five thousand, seven hundred ninety-two".