20668303 has 4 divisors (see below), whose sum is σ = 20724088. Its totient is φ = 20612520.

The previous prime is 20668279. The next prime is 20668331. The reversal of 20668303 is 30386602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30386602 = 2 ⋅15193301.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20668303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20668343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27333 + ... + 28078.

It is an arithmetic number, because the mean of its divisors is an integer number (5181022).

Almost surely, 2^20668303 is an apocalyptic number.

20668303 is a deficient number, since it is larger than the sum of its proper divisors (55785).

20668303 is an equidigital number, since it uses as much as digits as its factorization.

20668303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55784.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20668303 is about 4546.2405347716. The cubic root of 20668303 is about 274.4321195830.

The spelling of 20668303 in words is "twenty million, six hundred sixty-eight thousand, three hundred three".