20340513 has 12 divisors (see below), whose sum is σ = 30394260. Its totient is φ = 13092576.

The previous prime is 20340497. The next prime is 20340521. The reversal of 20340513 is 31504302.

It can be written as a sum of positive squares in 2 ways, for example, as 9529569 + 10810944 = 3087^2 + 3288^2 .

It is not a de Polignac number, because 20340513 - 2⁴ = 20340497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20340553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38706 + ... + 39227.

It is an arithmetic number, because the mean of its divisors is an integer number (2532855).

Almost surely, 2^20340513 is an apocalyptic number.

It is an amenable number.

20340513 is a deficient number, since it is larger than the sum of its proper divisors (10053747).

20340513 is a wasteful number, since it uses less digits than its factorization.

20340513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77968 (or 77965 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20340513 is about 4510.0457869073. The cubic root of 20340513 is about 272.9735916169.

Adding to 20340513 its reverse (31504302), we get a palindrome (51844815).

The spelling of 20340513 in words is "twenty million, three hundred forty thousand, five hundred thirteen".