19895055872 has 20 divisors (see below), whose sum is σ = 39751255236. Its totient is φ = 9947527680.

The previous prime is 19895055871. The next prime is 19895055899. The reversal of 19895055872 is 27855059891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19895055871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19428254 + ... + 19429277.

Almost surely, 2^19895055872 is an apocalyptic number.

It is an amenable number.

19895055872 is a deficient number, since it is larger than the sum of its proper divisors (19856199364).

19895055872 is an frugal number, since it uses more digits than its factorization.

19895055872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38857549 (or 38857533 counting only the distinct ones).

The product of its (nonzero) digits is 9072000, while the sum is 59.

The spelling of 19895055872 in words is "nineteen billion, eight hundred ninety-five million, fifty-five thousand, eight hundred seventy-two".