20564234 has 8 divisors (see below), whose sum is σ = 31563840. Its totient is φ = 10042956.

The previous prime is 20564209. The next prime is 20564279. The reversal of 20564234 is 43246502.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119474 + ... + 119645.

It is an arithmetic number, because the mean of its divisors is an integer number (3945480).

Almost surely, 2^20564234 is an apocalyptic number.

20564234 is a deficient number, since it is larger than the sum of its proper divisors (10999606).

20564234 is a wasteful number, since it uses less digits than its factorization.

20564234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239164.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 20564234 is about 4534.7804798027. The cubic root of 20564234 is about 273.9707376355.

The spelling of 20564234 in words is "twenty million, five hundred sixty-four thousand, two hundred thirty-four".