20560591 has 4 divisors (see below), whose sum is σ = 20583472. Its totient is φ = 20537712.

The previous prime is 20560583. The next prime is 20560601. The reversal of 20560591 is 19506502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20560591 - 2³ = 20560583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20560571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10035 + ... + 11908.

It is an arithmetic number, because the mean of its divisors is an integer number (5145868).

Almost surely, 2^20560591 is an apocalyptic number.

20560591 is a deficient number, since it is larger than the sum of its proper divisors (22881).

20560591 is an equidigital number, since it uses as much as digits as its factorization.

20560591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22880.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 20560591 is about 4534.3787887648. The cubic root of 20560591 is about 273.9545585039.

The spelling of 20560591 in words is "twenty million, five hundred sixty thousand, five hundred ninety-one".