20664444 has 12 divisors (see below), whose sum is σ = 48217064. Its totient is φ = 6888144.

The previous prime is 20664437. The next prime is 20664461. The reversal of 20664444 is 44446602.

It is a tau number, because it is divible by the number of its divisors (12).

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, 861007 + ... + 861030.

Almost surely, 2^20664444 is an apocalyptic number.

It is an amenable number.

20664444 is an abundant number, since it is smaller than the sum of its proper divisors (27552620).

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

20664444 is a wasteful number, since it uses less digits than its factorization.

20664444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1722044 (or 1722042 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 20664444 is about 4545.8160983480. The cubic root of 20664444 is about 274.4150386860.

The spelling of 20664444 in words is "twenty million, six hundred sixty-four thousand, four hundred forty-four".