20831938964 has 6 divisors (see below), whose sum is σ = 36455893194. Its totient is φ = 10415969480.

The previous prime is 20831938957. The next prime is 20831938969. The reversal of 20831938964 is 46983913802.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20781528964 + 50410000 = 144158^2 + 7100^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20831938969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2603992367 + ... + 2603992374.

It is an arithmetic number, because the mean of its divisors is an integer number (6075982199).

Almost surely, 2^20831938964 is an apocalyptic number.

It is an amenable number.

20831938964 is a deficient number, since it is larger than the sum of its proper divisors (15623954230).

20831938964 is a wasteful number, since it uses less digits than its factorization.

20831938964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5207984745 (or 5207984743 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 53.

The spelling of 20831938964 in words is "twenty billion, eight hundred thirty-one million, nine hundred thirty-eight thousand, nine hundred sixty-four".