19836864 has 42 divisors (see below), whose sum is σ = 56860440. Its totient is φ = 6612096.

The previous prime is 19836853. The next prime is 19836871. The reversal of 19836864 is 46863891.

It is a nude number because it is divisible by every one of its digits.

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 5 ways as a sum of consecutive naturals, for example, 16644 + ... + 17795.

It is an arithmetic number, because the mean of its divisors is an integer number (1353820).

Almost surely, 2^19836864 is an apocalyptic number.

It is an amenable number.

19836864 is an abundant number, since it is smaller than the sum of its proper divisors (37023576).

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

19836864 is a wasteful number, since it uses less digits than its factorization.

19836864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34457 (or 34444 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 19836864 is about 4453.8594499602. The cubic root of 19836864 is about 270.7017138027.

The spelling of 19836864 in words is "nineteen million, eight hundred thirty-six thousand, eight hundred sixty-four".