19855896 has 32 divisors (see below), whose sum is σ = 49977600. Its totient is φ = 6573600.

The previous prime is 19855873. The next prime is 19855907. The reversal of 19855896 is 69855891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 885 + ... + 6363.

It is an arithmetic number, because the mean of its divisors is an integer number (1561800).

Almost surely, 2^19855896 is an apocalyptic number.

It is an amenable number.

19855896 is an abundant number, since it is smaller than the sum of its proper divisors (30121704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19855896 is a wasteful number, since it uses less digits than its factorization.

19855896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5639 (or 5635 counting only the distinct ones).

The product of its digits is 777600, while the sum is 51.

The square root of 19855896 is about 4455.9955116674. The cubic root of 19855896 is about 270.7882588709.

The spelling of 19855896 in words is "nineteen million, eight hundred fifty-five thousand, eight hundred ninety-six".