19934434823 has 4 divisors (see below), whose sum is σ = 19963622088. Its totient is φ = 19905247560.

The previous prime is 19934434747. The next prime is 19934434837. The reversal of 19934434823 is 32843443991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19934434823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19934434853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14592608 + ... + 14593973.

It is an arithmetic number, because the mean of its divisors is an integer number (4990905522).

Almost surely, 2^19934434823 is an apocalyptic number.

19934434823 is a deficient number, since it is larger than the sum of its proper divisors (29187265).

19934434823 is an equidigital number, since it uses as much as digits as its factorization.

19934434823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29187264.

The product of its digits is 2239488, while the sum is 50.

The spelling of 19934434823 in words is "nineteen billion, nine hundred thirty-four million, four hundred thirty-four thousand, eight hundred twenty-three".