20664203 has 4 divisors (see below), whose sum is σ = 23616240. Its totient is φ = 17712168.

The previous prime is 20664139. The next prime is 20664239. The reversal of 20664203 is 30246602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20664203 - 2⁶ = 20664139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20660203) 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, 1476008 + ... + 1476021.

It is an arithmetic number, because the mean of its divisors is an integer number (5904060).

Almost surely, 2^20664203 is an apocalyptic number.

20664203 is a deficient number, since it is larger than the sum of its proper divisors (2952037).

20664203 is an equidigital number, since it uses as much as digits as its factorization.

20664203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2952036.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 20664203 is about 4545.7895903792. The cubic root of 20664203 is about 274.4139718893.

The spelling of 20664203 in words is "twenty million, six hundred sixty-four thousand, two hundred three".