20605173 has 16 divisors (see below), whose sum is σ = 30030336. Its totient is φ = 12510720.

The previous prime is 20605159. The next prime is 20605183. The reversal of 20605173 is 37150602.

It is not a de Polignac number, because 20605173 - 2⁴ = 20605157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20605183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4936 + ... + 8097.

It is an arithmetic number, because the mean of its divisors is an integer number (1876896).

Almost surely, 2^20605173 is an apocalyptic number.

It is an amenable number.

20605173 is a deficient number, since it is larger than the sum of its proper divisors (9425163).

20605173 is a wasteful number, since it uses less digits than its factorization.

20605173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13084.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 20605173 is about 4539.2921254310. The cubic root of 20605173 is about 274.1524228744.

Adding to 20605173 its reverse (37150602), we get a palindrome (57755775).

The spelling of 20605173 in words is "twenty million, six hundred five thousand, one hundred seventy-three".