20572163 has 2 divisors, whose sum is σ = 20572164. Its totient is φ = 20572162.

The previous prime is 20572151. The next prime is 20572171. The reversal of 20572163 is 36127502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20572163 - 2⁴ = 20572147 is a prime.

It is not a weakly prime, because it can be changed into another prime (20572133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10286081 + 10286082.

It is an arithmetic number, because the mean of its divisors is an integer number (10286082).

Almost surely, 2^20572163 is an apocalyptic number.

20572163 is a deficient number, since it is larger than the sum of its proper divisors (1).

20572163 is an equidigital number, since it uses as much as digits as its factorization.

20572163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20572163 is about 4535.6546385279. The cubic root of 20572163 is about 274.0059449578.

Adding to 20572163 its reverse (36127502), we get a palindrome (56699665).

The spelling of 20572163 in words is "twenty million, five hundred seventy-two thousand, one hundred sixty-three".