20448664 has 16 divisors (see below), whose sum is σ = 38970720. Its totient is φ = 10056480.

The previous prime is 20448661. The next prime is 20448689. The reversal of 20448664 is 46684402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20448661) 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, 20464 + ... + 21439.

It is an arithmetic number, because the mean of its divisors is an integer number (2435670).

Almost surely, 2^20448664 is an apocalyptic number.

It is an amenable number.

20448664 is a deficient number, since it is larger than the sum of its proper divisors (18522056).

20448664 is a wasteful number, since it uses less digits than its factorization.

20448664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41970 (or 41966 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 20448664 is about 4522.0199026541. The cubic root of 20448664 is about 273.4565390759.

It can be divided in two parts, 20448 and 664, that added together give a palindrome (21112).

The spelling of 20448664 in words is "twenty million, four hundred forty-eight thousand, six hundred sixty-four".