20706173 has 4 divisors (see below), whose sum is σ = 20743008. Its totient is φ = 20669340.

The previous prime is 20706167. The next prime is 20706209. The reversal of 20706173 is 37160702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20706173 - 2⁸ = 20705917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20706373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17561 + ... + 18702.

It is an arithmetic number, because the mean of its divisors is an integer number (5185752).

Almost surely, 2^20706173 is an apocalyptic number.

It is an amenable number.

20706173 is a deficient number, since it is larger than the sum of its proper divisors (36835).

20706173 is an equidigital number, since it uses as much as digits as its factorization.

20706173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36834.

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

The square root of 20706173 is about 4550.4036084725. The cubic root of 20706173 is about 274.5996289550.

Adding to 20706173 its reverse (37160702), we get a palindrome (57866875).

The spelling of 20706173 in words is "twenty million, seven hundred six thousand, one hundred seventy-three".