20808062917 has 8 divisors (see below), whose sum is σ = 22052243736. Its totient is φ = 19566124032.

The previous prime is 20808062867. The next prime is 20808062929. The reversal of 20808062917 is 71926080802.

It can be written as a sum of positive squares in 4 ways, for example, as 12124432321 + 8683630596 = 110111^2 + 93186^2 .

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 20808062917 - 2⁷ = 20808062789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20808062417) 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, 541348 + ... + 578509.

It is an arithmetic number, because the mean of its divisors is an integer number (2756530467).

Almost surely, 2^20808062917 is an apocalyptic number.

It is an amenable number.

20808062917 is a deficient number, since it is larger than the sum of its proper divisors (1244180819).

20808062917 is a wasteful number, since it uses less digits than its factorization.

20808062917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120967.

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 20808062917 in words is "twenty billion, eight hundred eight million, sixty-two thousand, nine hundred seventeen".