20988065238 has 24 divisors (see below), whose sum is σ = 48829376952. Its totient is φ = 5996589984.

The previous prime is 20988065237. The next prime is 20988065251. The reversal of 20988065238 is 83256088902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20988065233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35693695 + ... + 35694282.

It is an arithmetic number, because the mean of its divisors is an integer number (2034557373).

Almost surely, 2^20988065238 is an apocalyptic number.

20988065238 is an abundant number, since it is smaller than the sum of its proper divisors (27841311714).

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

20988065238 is a wasteful number, since it uses less digits than its factorization.

20988065238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71387996 (or 71387989 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 51.

The spelling of 20988065238 in words is "twenty billion, nine hundred eighty-eight million, sixty-five thousand, two hundred thirty-eight".