20564285 has 8 divisors (see below), whose sum is σ = 28202496. Its totient is φ = 14101200.

The previous prime is 20564281. The next prime is 20564287. The reversal of 20564285 is 58246502.

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

It is not a de Polignac number, because 20564285 - 2² = 20564281 is a prime.

It is a super-2 number, since 2×20564285² = 845779635122450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20564281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293741 + ... + 293810.

It is an arithmetic number, because the mean of its divisors is an integer number (3525312).

Almost surely, 2^20564285 is an apocalyptic number.

It is an amenable number.

20564285 is a deficient number, since it is larger than the sum of its proper divisors (7638211).

20564285 is an equidigital number, since it uses as much as digits as its factorization.

20564285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587563.

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 20564285 is about 4534.7861030042. The cubic root of 20564285 is about 273.9709641209.

The spelling of 20564285 in words is "twenty million, five hundred sixty-four thousand, two hundred eighty-five".