20618758317 has 8 divisors (see below), whose sum is σ = 27521274240. Its totient is φ = 13731040640.

The previous prime is 20618758297. The next prime is 20618758327. The reversal of 20618758317 is 71385781602.

It is a happy number.

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 20618758317 - 2¹¹ = 20618756269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20618758327) 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, 3696309 + ... + 3701882.

It is an arithmetic number, because the mean of its divisors is an integer number (3440159280).

Almost surely, 2^20618758317 is an apocalyptic number.

It is an amenable number.

20618758317 is a deficient number, since it is larger than the sum of its proper divisors (6902515923).

20618758317 is an equidigital number, since it uses as much as digits as its factorization.

20618758317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7399123.

The product of its (nonzero) digits is 564480, while the sum is 48.

The spelling of 20618758317 in words is "twenty billion, six hundred eighteen million, seven hundred fifty-eight thousand, three hundred seventeen".