20523331313 has 4 divisors (see below), whose sum is σ = 20704953828. Its totient is φ = 20341708800.

The previous prime is 20523331261. The next prime is 20523331331. The reversal of 20523331313 is 31313332502.

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 3440057104 + 17083274209 = 58652^2 + 130703^2 .

It is a cyclic number.

It is not a de Polignac number, because 20523331313 - 2⁶ = 20523331249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20523331333) 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, 90811088 + ... + 90811313.

It is an arithmetic number, because the mean of its divisors is an integer number (5176238457).

Almost surely, 2^20523331313 is an apocalyptic number.

It is an amenable number.

20523331313 is a deficient number, since it is larger than the sum of its proper divisors (181622515).

20523331313 is a wasteful number, since it uses less digits than its factorization.

20523331313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181622514.

The product of its (nonzero) digits is 4860, while the sum is 26.

Adding to 20523331313 its reverse (31313332502), we get a palindrome (51836663815).

The spelling of 20523331313 in words is "twenty billion, five hundred twenty-three million, three hundred thirty-one thousand, three hundred thirteen".