20318805617 has 8 divisors (see below), whose sum is σ = 22188530880. Its totient is φ = 18452840560.

The previous prime is 20318805589. The next prime is 20318805641. The reversal of 20318805617 is 71650881302.

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

It is not a de Polignac number, because 20318805617 - 2¹⁰ = 20318804593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20318801617) 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, 928742 + ... + 950367.

It is an arithmetic number, because the mean of its divisors is an integer number (2773566360).

Almost surely, 2^20318805617 is an apocalyptic number.

It is an amenable number.

20318805617 is a deficient number, since it is larger than the sum of its proper divisors (1869725263).

20318805617 is a wasteful number, since it uses less digits than its factorization.

20318805617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880103.

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 20318805617 in words is "twenty billion, three hundred eighteen million, eight hundred five thousand, six hundred seventeen".