20598913 has 2 divisors, whose sum is σ = 20598914. Its totient is φ = 20598912.

The previous prime is 20598887. The next prime is 20598931. The reversal of 20598913 is 31989502.

Together with next prime (20598931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13162384 + 7436529 = 3628^2 + 2727^2 .

It is a cyclic number.

It is not a de Polignac number, because 20598913 - 2⁵ = 20598881 is a prime.

It is not a weakly prime, because it can be changed into another prime (20598943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10299456 + 10299457.

It is an arithmetic number, because the mean of its divisors is an integer number (10299457).

Almost surely, 2^20598913 is an apocalyptic number.

It is an amenable number.

20598913 is a deficient number, since it is larger than the sum of its proper divisors (1).

20598913 is an equidigital number, since it uses as much as digits as its factorization.

20598913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 20598913 is about 4538.6025382269. The cubic root of 20598913 is about 274.1246569020.

The spelling of 20598913 in words is "twenty million, five hundred ninety-eight thousand, nine hundred thirteen".