19996206209 has 24 divisors (see below), whose sum is σ = 23634635040. Its totient is φ = 16865319744.

The previous prime is 19996206203. The next prime is 19996206229. The reversal of 19996206209 is 90260269991.

It is a de Polignac number, because none of the positive numbers 2^k-19996206209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19996206203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1578302 + ... + 1590920.

It is an arithmetic number, because the mean of its divisors is an integer number (984776460).

Almost surely, 2^19996206209 is an apocalyptic number.

It is an amenable number.

19996206209 is a deficient number, since it is larger than the sum of its proper divisors (3638428831).

19996206209 is a wasteful number, since it uses less digits than its factorization.

19996206209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13149 (or 13142 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 53.

The spelling of 19996206209 in words is "nineteen billion, nine hundred ninety-six million, two hundred six thousand, two hundred nine".