20444664 has 32 divisors (see below), whose sum is σ = 51408000. Its totient is φ = 6775392.

The previous prime is 20444639. The next prime is 20444689. The reversal of 20444664 is 46644402.

It is an interprime number because it is at equal distance from previous prime (20444639) and next prime (20444689).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1917 + ... + 6675.

It is an arithmetic number, because the mean of its divisors is an integer number (1606500).

Almost surely, 2^20444664 is an apocalyptic number.

20444664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20444664 is an abundant number, since it is smaller than the sum of its proper divisors (30963336).

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

20444664 is a wasteful number, since it uses less digits than its factorization.

20444664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4947 (or 4943 counting only the distinct ones).

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

The square root of 20444664 is about 4521.5776007938. The cubic root of 20444664 is about 273.4387074711.

The spelling of 20444664 in words is "twenty million, four hundred forty-four thousand, six hundred sixty-four".