20668233 has 4 divisors (see below), whose sum is σ = 27557648. Its totient is φ = 13778820.

The previous prime is 20668229. The next prime is 20668247. The reversal of 20668233 is 33286602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20668233 - 2² = 20668229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20668233.

It is not an unprimeable number, because it can be changed into a prime (20668273) 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, 3444703 + ... + 3444708.

It is an arithmetic number, because the mean of its divisors is an integer number (6889412).

Almost surely, 2^20668233 is an apocalyptic number.

It is an amenable number.

20668233 is a deficient number, since it is larger than the sum of its proper divisors (6889415).

20668233 is an equidigital number, since it uses as much as digits as its factorization.

20668233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6889414.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 20668233 is about 4546.2328360963. The cubic root of 20668233 is about 274.4318097645.

The spelling of 20668233 in words is "twenty million, six hundred sixty-eight thousand, two hundred thirty-three".