20748163 has 2 divisors, whose sum is σ = 20748164. Its totient is φ = 20748162.

The previous prime is 20748151. The next prime is 20748179. The reversal of 20748163 is 36184702.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20748163 is a prime.

It is not a weakly prime, because it can be changed into another prime (20748193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10374081 + 10374082.

It is an arithmetic number, because the mean of its divisors is an integer number (10374082).

Almost surely, 2^20748163 is an apocalyptic number.

20748163 is a deficient number, since it is larger than the sum of its proper divisors (1).

20748163 is an equidigital number, since it uses as much as digits as its factorization.

20748163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20748163 is about 4555.0151481636. The cubic root of 20748163 is about 274.7851236061.

The spelling of 20748163 in words is "twenty million, seven hundred forty-eight thousand, one hundred sixty-three".