20564436 has 24 divisors (see below), whose sum is σ = 48232800. Its totient is φ = 6819232.

The previous prime is 20564431. The next prime is 20564459. The reversal of 20564436 is 63446502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20564431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1986 + ... + 6713.

It is an arithmetic number, because the mean of its divisors is an integer number (2009700).

Almost surely, 2^20564436 is an apocalyptic number.

It is an amenable number.

20564436 is an abundant number, since it is smaller than the sum of its proper divisors (27668364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20564436 is a wasteful number, since it uses less digits than its factorization.

20564436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8903 (or 8901 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 20564436 is about 4534.8027520500. The cubic root of 20564436 is about 273.9716346931.

The spelling of 20564436 in words is "twenty million, five hundred sixty-four thousand, four hundred thirty-six".