20664163 has 8 divisors (see below), whose sum is σ = 23563008. Its totient is φ = 17952384.

The previous prime is 20664139. The next prime is 20664239. The reversal of 20664163 is 36146602.

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

It is a cyclic number.

It is not a de Polignac number, because 20664163 - 2⁵ = 20664131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20664113) 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, 46531 + ... + 46972.

It is an arithmetic number, because the mean of its divisors is an integer number (2945376).

Almost surely, 2^20664163 is an apocalyptic number.

20664163 is a deficient number, since it is larger than the sum of its proper divisors (2898845).

20664163 is a wasteful number, since it uses less digits than its factorization.

20664163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93533.

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

The square root of 20664163 is about 4545.7851907014. The cubic root of 20664163 is about 274.4137948268.

The spelling of 20664163 in words is "twenty million, six hundred sixty-four thousand, one hundred sixty-three".