20664533 has 12 divisors (see below), whose sum is σ = 22330080. Its totient is φ = 19069920.

The previous prime is 20664529. The next prime is 20664587. The reversal of 20664533 is 33546602.

It is not a de Polignac number, because 20664533 - 2² = 20664529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20664496 and 20664505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664433) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 31616 + ... + 32262.

It is an arithmetic number, because the mean of its divisors is an integer number (1860840).

Almost surely, 2^20664533 is an apocalyptic number.

It is an amenable number.

20664533 is a deficient number, since it is larger than the sum of its proper divisors (1665547).

20664533 is an equidigital number, since it uses as much as digits as its factorization.

20664533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748 (or 707 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 20664533 is about 4545.8258875588. The cubic root of 20664533 is about 274.4154326461.

The spelling of 20664533 in words is "twenty million, six hundred sixty-four thousand, five hundred thirty-three".