20565343 has 4 divisors (see below), whose sum is σ = 20587248. Its totient is φ = 20543440.

The previous prime is 20565331. The next prime is 20565371. The reversal of 20565343 is 34356502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20565343 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 (20565323) 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, 9478 + ... + 11443.

It is an arithmetic number, because the mean of its divisors is an integer number (5146812).

Almost surely, 2^20565343 is an apocalyptic number.

20565343 is a deficient number, since it is larger than the sum of its proper divisors (21905).

20565343 is an equidigital number, since it uses as much as digits as its factorization.

20565343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21904.

The product of its (nonzero) digits is 10800, while the sum is 28.

The square root of 20565343 is about 4534.9027552970. The cubic root of 20565343 is about 273.9756624981.

The spelling of 20565343 in words is "twenty million, five hundred sixty-five thousand, three hundred forty-three".