20958163 has 2 divisors, whose sum is σ = 20958164. Its totient is φ = 20958162.

The previous prime is 20958151. The next prime is 20958173. The reversal of 20958163 is 36185902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20958163 is a prime.

It is not a weakly prime, because it can be changed into another prime (20958173) 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 as a sum of consecutive naturals, namely, 10479081 + 10479082.

It is an arithmetic number, because the mean of its divisors is an integer number (10479082).

Almost surely, 2^20958163 is an apocalyptic number.

20958163 is a deficient number, since it is larger than the sum of its proper divisors (1).

20958163 is an equidigital number, since it uses as much as digits as its factorization.

20958163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20958163 is about 4578.0086282138. The cubic root of 20958163 is about 275.7090813728.

The spelling of 20958163 in words is "twenty million, nine hundred fifty-eight thousand, one hundred sixty-three".