20397938608 has 20 divisors (see below), whose sum is σ = 41239311408. Its totient is φ = 9755535680.

The previous prime is 20397938581. The next prime is 20397938609. The reversal of 20397938608 is 80683979302.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20397938609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27714223 + ... + 27714958.

Almost surely, 2^20397938608 is an apocalyptic number.

It is an amenable number.

20397938608 is an abundant number, since it is smaller than the sum of its proper divisors (20841372800).

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

20397938608 is a wasteful number, since it uses less digits than its factorization.

20397938608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55429212 (or 55429206 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 55.

The spelling of 20397938608 in words is "twenty billion, three hundred ninety-seven million, nine hundred thirty-eight thousand, six hundred eight".