20831967771 has 8 divisors (see below), whose sum is σ = 27895168080. Its totient is φ = 13828372992.

The previous prime is 20831967719. The next prime is 20831967799. The reversal of 20831967771 is 17776913802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20831967771 - 2⁷ = 20831967643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20831967371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14900566 + ... + 14901963.

It is an arithmetic number, because the mean of its divisors is an integer number (3486896010).

Almost surely, 2^20831967771 is an apocalyptic number.

20831967771 is a deficient number, since it is larger than the sum of its proper divisors (7063200309).

20831967771 is a wasteful number, since it uses less digits than its factorization.

20831967771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29802765.

The product of its (nonzero) digits is 889056, while the sum is 51.

The spelling of 20831967771 in words is "twenty billion, eight hundred thirty-one million, nine hundred sixty-seven thousand, seven hundred seventy-one".