18839020887 has 24 divisors (see below), whose sum is σ = 27475675344. Its totient is φ = 12437800704.

The previous prime is 18839020873. The next prime is 18839020891. The reversal of 18839020887 is 78802093881.

It is not a de Polignac number, because 18839020887 - 2⁸ = 18839020631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18839020817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1322133 + ... + 1336305.

It is an arithmetic number, because the mean of its divisors is an integer number (1144819806).

Almost surely, 2^18839020887 is an apocalyptic number.

18839020887 is a deficient number, since it is larger than the sum of its proper divisors (8636654457).

18839020887 is a wasteful number, since it uses less digits than its factorization.

18839020887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15599 (or 15596 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 54.

The spelling of 18839020887 in words is "eighteen billion, eight hundred thirty-nine million, twenty thousand, eight hundred eighty-seven".