20604626917 has 4 divisors (see below), whose sum is σ = 23548145056. Its totient is φ = 17661108780.

The previous prime is 20604626879. The next prime is 20604626921. The reversal of 20604626917 is 71962640602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20604626917 - 2⁷ = 20604626789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20604626417) 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 3 ways as a sum of consecutive naturals, for example, 1471759059 + ... + 1471759072.

It is an arithmetic number, because the mean of its divisors is an integer number (5887036264).

Almost surely, 2^20604626917 is an apocalyptic number.

It is an amenable number.

20604626917 is a deficient number, since it is larger than the sum of its proper divisors (2943518139).

20604626917 is an equidigital number, since it uses as much as digits as its factorization.

20604626917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2943518138.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 20604626917 in words is "twenty billion, six hundred four million, six hundred twenty-six thousand, nine hundred seventeen".