20638064 has 20 divisors (see below), whose sum is σ = 41277120. Its totient is φ = 9985920.

The previous prime is 20638043. The next prime is 20638081. The reversal of 20638064 is 46083602.

20638064 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 20309 + ... + 21300.

It is an arithmetic number, because the mean of its divisors is an integer number (2063856).

Almost surely, 2^20638064 is an apocalyptic number.

It is an amenable number.

20638064 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.

20638064 is a wasteful number, since it uses less digits than its factorization.

20638064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41648 (or 41642 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 20638064 is about 4542.9136025243. The cubic root of 20638064 is about 274.2982172293.

The spelling of 20638064 in words is "twenty million, six hundred thirty-eight thousand, sixty-four".