20536013 has 2 divisors, whose sum is σ = 20536014. Its totient is φ = 20536012.

The previous prime is 20535947. The next prime is 20536057. The reversal of 20536013 is 31063502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11276164 + 9259849 = 3358^2 + 3043^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20536013 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20536063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10268006 + 10268007.

It is an arithmetic number, because the mean of its divisors is an integer number (10268007).

Almost surely, 2^20536013 is an apocalyptic number.

It is an amenable number.

20536013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20536013 is an equidigital number, since it uses as much as digits as its factorization.

20536013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 20536013 is about 4531.6677945322. The cubic root of 20536013 is about 273.8453537979.

Adding to 20536013 its reverse (31063502), we get a palindrome (51599515).

The spelling of 20536013 in words is "twenty million, five hundred thirty-six thousand, thirteen".