20568513 has 16 divisors (see below), whose sum is σ = 31406976. Its totient is φ = 11729280.

The previous prime is 20568497. The next prime is 20568533. The reversal of 20568513 is 31586502.

It is not a de Polignac number, because 20568513 - 2⁴ = 20568497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20568533) 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 15 ways as a sum of consecutive naturals, for example, 16645 + ... + 17837.

It is an arithmetic number, because the mean of its divisors is an integer number (1962936).

Almost surely, 2^20568513 is an apocalyptic number.

It is an amenable number.

20568513 is a deficient number, since it is larger than the sum of its proper divisors (10838463).

20568513 is a wasteful number, since it uses less digits than its factorization.

20568513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2024.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 20568513 is about 4535.2522531828. The cubic root of 20568513 is about 273.9897389021.

The spelling of 20568513 in words is "twenty million, five hundred sixty-eight thousand, five hundred thirteen".