20938540188 has 24 divisors (see below), whose sum is σ = 49778417808. Its totient is φ = 6847824256.

The previous prime is 20938540187. The next prime is 20938540201. The reversal of 20938540188 is 88104583902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20938540187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16460481 + ... + 16461752.

It is an arithmetic number, because the mean of its divisors is an integer number (2074100742).

Almost surely, 2^20938540188 is an apocalyptic number.

It is an amenable number.

20938540188 is an abundant number, since it is smaller than the sum of its proper divisors (28839877620).

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

20938540188 is a wasteful number, since it uses less digits than its factorization.

20938540188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32922293 (or 32922291 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 48.

The spelling of 20938540188 in words is "twenty billion, nine hundred thirty-eight million, five hundred forty thousand, one hundred eighty-eight".