20670173 has 2 divisors, whose sum is σ = 20670174. Its totient is φ = 20670172.

The previous prime is 20670163. The next prime is 20670179. The reversal of 20670173 is 37107602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20593444 + 76729 = 4538^2 + 277^2 .

It is a cyclic number.

It is not a de Polignac number, because 20670173 - 2⁸ = 20669917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20670179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10335086 + 10335087.

It is an arithmetic number, because the mean of its divisors is an integer number (10335087).

Almost surely, 2^20670173 is an apocalyptic number.

It is an amenable number.

20670173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20670173 is an equidigital number, since it uses as much as digits as its factorization.

20670173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 20670173 is about 4546.4461945568. The cubic root of 20670173 is about 274.4403959049.

Adding to 20670173 its reverse (37107602), we get a palindrome (57777775).

The spelling of 20670173 in words is "twenty million, six hundred seventy thousand, one hundred seventy-three".