19892994687 has 20 divisors (see below), whose sum is σ = 30203862216. Its totient is φ = 13044583440.

The previous prime is 19892994647. The next prime is 19892994701. The reversal of 19892994687 is 78649929891.

It is not a de Polignac number, because 19892994687 - 2¹² = 19892990591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19892994647) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2008113 + ... + 2017994.

Almost surely, 2^19892994687 is an apocalyptic number.

19892994687 is a deficient number, since it is larger than the sum of its proper divisors (10310867529).

19892994687 is an equidigital number, since it uses as much as digits as its factorization.

19892994687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4026180 (or 4026171 counting only the distinct ones).

The product of its digits is 141087744, while the sum is 72.

The spelling of 19892994687 in words is "nineteen billion, eight hundred ninety-two million, nine hundred ninety-four thousand, six hundred eighty-seven".