20564204 has 6 divisors (see below), whose sum is σ = 35987364. Its totient is φ = 10282100.

The previous prime is 20564189. The next prime is 20564207. The reversal of 20564204 is 40246502.

It is a self number, because there is not a number n which added to its sum of digits gives 20564204.

It is not an unprimeable number, because it can be changed into a prime (20564207) 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 as a sum of consecutive naturals, namely, 2570522 + ... + 2570529.

It is an arithmetic number, because the mean of its divisors is an integer number (5997894).

Almost surely, 2^20564204 is an apocalyptic number.

It is an amenable number.

20564204 is a deficient number, since it is larger than the sum of its proper divisors (15423160).

20564204 is a wasteful number, since it uses less digits than its factorization.

20564204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5141055 (or 5141053 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 20564204 is about 4534.7771720339. Note that the first 3 decimals coincide. The cubic root of 20564204 is about 273.9706044086.

The spelling of 20564204 in words is "twenty million, five hundred sixty-four thousand, two hundred four".