20312640250213 has 8 divisors (see below), whose sum is σ = 22249139422680. Its totient is φ = 18458545297920.

The previous prime is 20312640250207. The next prime is 20312640250229. The reversal of 20312640250213 is 31205204621302.

It can be written as a sum of positive squares in 4 ways, for example, as 4009473602689 + 16303166647524 = 2002367^2 + 4037718^2 .

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 20312640250213 - 2²⁵ = 20312606695781 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 (20312640250313) 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, 20601054528 + ... + 20601055513.

It is an arithmetic number, because the mean of its divisors is an integer number (2781142427835).

Almost surely, 2^{20312640250213} is an apocalyptic number.

It is an amenable number.

20312640250213 is a deficient number, since it is larger than the sum of its proper divisors (1936499172467).

20312640250213 is a wasteful number, since it uses less digits than its factorization.

20312640250213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41202110087.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 20312640250213 its reverse (31205204621302), we get a palindrome (51517844871515).

The spelling of 20312640250213 in words is "twenty trillion, three hundred twelve billion, six hundred forty million, two hundred fifty thousand, two hundred thirteen".