19720695608 has 16 divisors (see below), whose sum is σ = 37024150680. Its totient is φ = 9847588768.

The previous prime is 19720695607. The next prime is 19720695611. The reversal of 19720695608 is 80659602791.

It is a self number, because there is not a number n which added to its sum of digits gives 19720695608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19720695607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1588310 + ... + 1600677.

Almost surely, 2^19720695608 is an apocalyptic number.

It is an amenable number.

19720695608 is a deficient number, since it is larger than the sum of its proper divisors (17303455072).

19720695608 is a wasteful number, since it uses less digits than its factorization.

19720695608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3189766 (or 3189762 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 19720695608 in words is "nineteen billion, seven hundred twenty million, six hundred ninety-five thousand, six hundred eight".