19688942844 has 36 divisors (see below), whose sum is σ = 50103307800. Its totient is φ = 6518932320.

The previous prime is 19688942843. The next prime is 19688942849. The reversal of 19688942844 is 44824988691.

19688942844 is a `hidden beast` number, since 1 + 96 + 8 + 89 + 428 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19688942843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1829922 + ... + 1840649.

It is an arithmetic number, because the mean of its divisors is an integer number (1391758550).

Almost surely, 2^19688942844 is an apocalyptic number.

It is an amenable number.

19688942844 is an abundant number, since it is smaller than the sum of its proper divisors (30414364956).

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

19688942844 is a wasteful number, since it uses less digits than its factorization.

19688942844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3670730 (or 3670725 counting only the distinct ones).

The product of its digits is 31850496, while the sum is 63.

The spelling of 19688942844 in words is "nineteen billion, six hundred eighty-eight million, nine hundred forty-two thousand, eight hundred forty-four".