20931714689 has 8 divisors (see below), whose sum is σ = 21403659240. Its totient is φ = 20462622336.

The previous prime is 20931714679. The next prime is 20931714697. The reversal of 20931714689 is 98641713902.

It can be written as a sum of positive squares in 4 ways, for example, as 2437890625 + 18493824064 = 49375^2 + 135992^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20931714689 - 2¹² = 20931710593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20931714619) 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 in 7 ways as a sum of consecutive naturals, for example, 698204 + ... + 727565.

It is an arithmetic number, because the mean of its divisors is an integer number (2675457405).

Almost surely, 2^20931714689 is an apocalyptic number.

It is an amenable number.

20931714689 is a deficient number, since it is larger than the sum of its proper divisors (471944551).

20931714689 is a wasteful number, since it uses less digits than its factorization.

20931714689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426099.

The product of its (nonzero) digits is 653184, while the sum is 50.

The spelling of 20931714689 in words is "twenty billion, nine hundred thirty-one million, seven hundred fourteen thousand, six hundred eighty-nine".