20564242 has 4 divisors (see below), whose sum is σ = 30846366. Its totient is φ = 10282120.

The previous prime is 20564209. The next prime is 20564279. The reversal of 20564242 is 24246502.

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

It can be written as a sum of positive squares in only one way, i.e., 18071001 + 2493241 = 4251^2 + 1579^2 .

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 as a sum of consecutive naturals, namely, 5141059 + ... + 5141062.

Almost surely, 2^20564242 is an apocalyptic number.

20564242 is a deficient number, since it is larger than the sum of its proper divisors (10282124).

20564242 is a wasteful number, since it uses less digits than its factorization.

20564242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10282123.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 20564242 is about 4534.7813618740. The cubic root of 20564242 is about 273.9707731626.

The spelling of 20564242 in words is "twenty million, five hundred sixty-four thousand, two hundred forty-two".