20005613 has 8 divisors (see below), whose sum is σ = 21153600. Its totient is φ = 18867168.

The previous prime is 20005603. The next prime is 20005637. The reversal of 20005613 is 31650002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20005613 - 2⁸ = 20005357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20005591 and 20005600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2168 + ... + 6686.

It is an arithmetic number, because the mean of its divisors is an integer number (2644200).

Almost surely, 2^20005613 is an apocalyptic number.

It is an amenable number.

20005613 is a deficient number, since it is larger than the sum of its proper divisors (1147987).

20005613 is a wasteful number, since it uses less digits than its factorization.

20005613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4771.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 20005613 is about 4472.7634634530. The cubic root of 20005613 is about 271.4671526611.

Adding to 20005613 its reverse (31650002), we get a palindrome (51655615).

The spelling of 20005613 in words is "twenty million, five thousand, six hundred thirteen".