19995702128 has 20 divisors (see below), whose sum is σ = 38745077448. Its totient is φ = 9996972480.

The previous prime is 19995702113. The next prime is 19995702187. The reversal of 19995702128 is 82120759991.

It is a happy number.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 19995702128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157823 + ... + 254753.

Almost surely, 2^19995702128 is an apocalyptic number.

It is an amenable number.

19995702128 is a deficient number, since it is larger than the sum of its proper divisors (18749375320).

19995702128 is a wasteful number, since it uses less digits than its factorization.

19995702128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109832 (or 109826 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 53.

The spelling of 19995702128 in words is "nineteen billion, nine hundred ninety-five million, seven hundred two thousand, one hundred twenty-eight".