20568223 has 4 divisors (see below), whose sum is σ = 22150408. Its totient is φ = 18986040.

The previous prime is 20568211. The next prime is 20568227. The reversal of 20568223 is 32286502.

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-20568223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20568191 and 20568200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20568227) 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, 791073 + ... + 791098.

It is an arithmetic number, because the mean of its divisors is an integer number (5537602).

Almost surely, 2^20568223 is an apocalyptic number.

20568223 is a deficient number, since it is larger than the sum of its proper divisors (1582185).

20568223 is a wasteful number, since it uses less digits than its factorization.

20568223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1582184.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20568223 is about 4535.2202813094. The cubic root of 20568223 is about 273.9884512155.

The spelling of 20568223 in words is "twenty million, five hundred sixty-eight thousand, two hundred twenty-three".