20564860 has 12 divisors (see below), whose sum is σ = 43186248. Its totient is φ = 8225936.

The previous prime is 20564839. The next prime is 20564867. The reversal of 20564860 is 6846502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20564867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 514102 + ... + 514141.

It is an arithmetic number, because the mean of its divisors is an integer number (3598854).

Almost surely, 2^20564860 is an apocalyptic number.

20564860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20564860 is an abundant number, since it is smaller than the sum of its proper divisors (22621388).

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

20564860 is a wasteful number, since it uses less digits than its factorization.

20564860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028252 (or 1028250 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 20564860 is about 4534.8495013616. The cubic root of 20564860 is about 273.9735176068.

The spelling of 20564860 in words is "twenty million, five hundred sixty-four thousand, eight hundred sixty".