20664488 has 64 divisors (see below), whose sum is σ = 44634240. Its totient is φ = 8895744.

The previous prime is 20664473. The next prime is 20664509. The reversal of 20664488 is 88446602.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 126695 + ... + 126857.

It is an arithmetic number, because the mean of its divisors is an integer number (697410).

Almost surely, 2^20664488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20664488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22317120).

20664488 is an abundant number, since it is smaller than the sum of its proper divisors (23969752).

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

20664488 is a wasteful number, since it uses less digits than its factorization.

20664488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258 (or 254 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 20664488 is about 4545.8209379605. The cubic root of 20664488 is about 274.4152334529.

The spelling of 20664488 in words is "twenty million, six hundred sixty-four thousand, four hundred eighty-eight".