20670163 has 2 divisors, whose sum is σ = 20670164. Its totient is φ = 20670162.

The previous prime is 20670151. The next prime is 20670173. The reversal of 20670163 is 36107602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20670163 - 2⁹ = 20669651 is a prime.

It is not a weakly prime, because it can be changed into another prime (20670173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10335081 + 10335082.

It is an arithmetic number, because the mean of its divisors is an integer number (10335082).

Almost surely, 2^20670163 is an apocalyptic number.

20670163 is a deficient number, since it is larger than the sum of its proper divisors (1).

20670163 is an equidigital number, since it uses as much as digits as its factorization.

20670163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 20670163 is about 4546.4450947966. The cubic root of 20670163 is about 274.4403516479.

Adding to 20670163 its reverse (36107602), we get a palindrome (56777765).

The spelling of 20670163 in words is "twenty million, six hundred seventy thousand, one hundred sixty-three".