20188735902 has 12 divisors (see below), whose sum is σ = 43742261160. Its totient is φ = 6729578628.

The previous prime is 20188735891. The next prime is 20188735909. The reversal of 20188735902 is 20953788102.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20188735909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 560798202 + ... + 560798237.

It is an arithmetic number, because the mean of its divisors is an integer number (3645188430).

Almost surely, 2^20188735902 is an apocalyptic number.

20188735902 is an abundant number, since it is smaller than the sum of its proper divisors (23553525258).

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

20188735902 is a wasteful number, since it uses less digits than its factorization.

20188735902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121596447 (or 1121596444 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 20188735902 in words is "twenty billion, one hundred eighty-eight million, seven hundred thirty-five thousand, nine hundred two".