19899389902 has 32 divisors (see below), whose sum is σ = 34834003200. Its totient is φ = 8522289720.

The previous prime is 19899389897. The next prime is 19899389921. The reversal of 19899389902 is 20998399891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1040793 + ... + 1059739.

It is an arithmetic number, because the mean of its divisors is an integer number (1088562600).

Almost surely, 2^19899389902 is an apocalyptic number.

19899389902 is a deficient number, since it is larger than the sum of its proper divisors (14934613298).

19899389902 is a wasteful number, since it uses less digits than its factorization.

19899389902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20501 (or 20487 counting only the distinct ones).

The product of its (nonzero) digits is 22674816, while the sum is 67.

The spelling of 19899389902 in words is "nineteen billion, eight hundred ninety-nine million, three hundred eighty-nine thousand, nine hundred two".