20536913 has 2 divisors, whose sum is σ = 20536914. Its totient is φ = 20536912.

The previous prime is 20536909. The next prime is 20536921. The reversal of 20536913 is 31963502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20367169 + 169744 = 4513^2 + 412^2 .

It is a cyclic number.

It is not a de Polignac number, because 20536913 - 2² = 20536909 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20536933) 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 as a sum of consecutive naturals, namely, 10268456 + 10268457.

It is an arithmetic number, because the mean of its divisors is an integer number (10268457).

Almost surely, 2^20536913 is an apocalyptic number.

It is an amenable number.

20536913 is a deficient number, since it is larger than the sum of its proper divisors (1).

20536913 is an equidigital number, since it uses as much as digits as its factorization.

20536913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 20536913 is about 4531.7670946332. The cubic root of 20536913 is about 273.8493542047.

The spelling of 20536913 in words is "twenty million, five hundred thirty-six thousand, nine hundred thirteen".