20664803 has 8 divisors (see below), whose sum is σ = 21012480. Its totient is φ = 20320200.

The previous prime is 20664793. The next prime is 20664823. The reversal of 20664803 is 30846602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20664803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20664823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15518 + ... + 16796.

It is an arithmetic number, because the mean of its divisors is an integer number (2626560).

Almost surely, 2^20664803 is an apocalyptic number.

20664803 is a deficient number, since it is larger than the sum of its proper divisors (347677).

20664803 is a wasteful number, since it uses less digits than its factorization.

20664803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 20664803 is about 4545.8555850357. The cubic root of 20664803 is about 274.4166277993.

The spelling of 20664803 in words is "twenty million, six hundred sixty-four thousand, eight hundred three".