20542613 has 32 divisors (see below), whose sum is σ = 27417600. Its totient is φ = 15240960.

The previous prime is 20542603. The next prime is 20542633. The reversal of 20542613 is 31624502.

It is not a de Polignac number, because 20542613 - 2¹⁶ = 20477077 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20542603) 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 31 ways as a sum of consecutive naturals, for example, 75668 + ... + 75938.

It is an arithmetic number, because the mean of its divisors is an integer number (856800).

Almost surely, 2^20542613 is an apocalyptic number.

It is an amenable number.

20542613 is a deficient number, since it is larger than the sum of its proper divisors (6874987).

20542613 is a wasteful number, since it uses less digits than its factorization.

20542613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20542613 is about 4532.3959447515. The cubic root of 20542613 is about 273.8746874008.

The spelling of 20542613 in words is "twenty million, five hundred forty-two thousand, six hundred thirteen".