20564012 has 12 divisors (see below), whose sum is σ = 41128080. Its totient is φ = 8813136.

The previous prime is 20563981. The next prime is 20564021. The reversal of 20564012 is 21046502.

It is a happy number.

20564012 is an admirable number.

It is a super-2 number, since 2×20564012² = 845757179072288, which contains 22 as substring.

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 in 3 ways as a sum of consecutive naturals, for example, 367187 + ... + 367242.

It is an arithmetic number, because the mean of its divisors is an integer number (3427340).

Almost surely, 2^20564012 is an apocalyptic number.

It is an amenable number.

20564012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20564012 is a wasteful number, since it uses less digits than its factorization.

20564012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734440 (or 734438 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20564012 is about 4534.7560022564. The cubic root of 20564012 is about 273.9697517535.

The spelling of 20564012 in words is "twenty million, five hundred sixty-four thousand, twelve".