20884604931 has 24 divisors (see below), whose sum is σ = 30344680080. Its totient is φ = 13841021376.

The previous prime is 20884604911. The next prime is 20884604981. The reversal of 20884604931 is 13940648802.

It is a happy number.

20884604931 is a `hidden beast` number, since 2 + 0 + 8 + 8 + 4 + 604 + 9 + 31 = 666.

It is not a de Polignac number, because 20884604931 - 2⁵ = 20884604899 is a prime.

It is a super-2 number, since 2×20884604931² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20884604911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2529496 + ... + 2537738.

It is an arithmetic number, because the mean of its divisors is an integer number (1264361670).

Almost surely, 2^20884604931 is an apocalyptic number.

20884604931 is a deficient number, since it is larger than the sum of its proper divisors (9460075149).

20884604931 is a wasteful number, since it uses less digits than its factorization.

20884604931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9875 (or 9872 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 20884604931 in words is "twenty billion, eight hundred eighty-four million, six hundred four thousand, nine hundred thirty-one".