20933609317 has 8 divisors (see below), whose sum is σ = 21463568280. Its totient is φ = 20404573440.

The previous prime is 20933609299. The next prime is 20933609329. The reversal of 20933609317 is 71390633902.

It can be written as a sum of positive squares in 4 ways, for example, as 1512120996 + 19421488321 = 38886^2 + 139361^2 .

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 20933609317 - 2⁷ = 20933609189 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 (20933609357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184728 + ... + 275665.

It is an arithmetic number, because the mean of its divisors is an integer number (2682946035).

Almost surely, 2^20933609317 is an apocalyptic number.

It is an amenable number.

20933609317 is a deficient number, since it is larger than the sum of its proper divisors (529958963).

20933609317 is a wasteful number, since it uses less digits than its factorization.

20933609317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461543.

The product of its (nonzero) digits is 183708, while the sum is 43.

The spelling of 20933609317 in words is "twenty billion, nine hundred thirty-three million, six hundred nine thousand, three hundred seventeen".