20317231337 has 4 divisors (see below), whose sum is σ = 21880095300. Its totient is φ = 18754367376.

The previous prime is 20317231261. The next prime is 20317231343. The reversal of 20317231337 is 73313271302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13830700816 + 6486530521 = 117604^2 + 80539^2 .

It is a cyclic number.

It is not a de Polignac number, because 20317231337 - 2¹⁶ = 20317165801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20317231237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781431962 + ... + 781431987.

It is an arithmetic number, because the mean of its divisors is an integer number (5470023825).

Almost surely, 2^20317231337 is an apocalyptic number.

It is an amenable number.

20317231337 is a deficient number, since it is larger than the sum of its proper divisors (1562863963).

20317231337 is a wasteful number, since it uses less digits than its factorization.

20317231337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562863962.

The product of its (nonzero) digits is 15876, while the sum is 32.

The spelling of 20317231337 in words is "twenty billion, three hundred seventeen million, two hundred thirty-one thousand, three hundred thirty-seven".