20664267 has 32 divisors (see below), whose sum is σ = 31718400. Its totient is φ = 11860992.

The previous prime is 20664257. The next prime is 20664289. The reversal of 20664267 is 76246602.

It is not a de Polignac number, because 20664267 - 2⁷ = 20664139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20664257) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58363 + ... + 58715.

It is an arithmetic number, because the mean of its divisors is an integer number (991200).

Almost surely, 2^20664267 is an apocalyptic number.

20664267 is a deficient number, since it is larger than the sum of its proper divisors (11054133).

20664267 is a wasteful number, since it uses less digits than its factorization.

20664267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 20664267 is about 4545.7966298549. The cubic root of 20664267 is about 274.4142551888.

The spelling of 20664267 in words is "twenty million, six hundred sixty-four thousand, two hundred sixty-seven".