20994173 has 8 divisors (see below), whose sum is σ = 22249080. Its totient is φ = 19774720.

The previous prime is 20994151. The next prime is 20994179. The reversal of 20994173 is 37149902.

It can be written as a sum of positive squares in 4 ways, for example, as 182329 + 20811844 = 427^2 + 4562^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20994173 - 2⁶ = 20994109 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 (20994179) 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 in 7 ways as a sum of consecutive naturals, for example, 7640 + ... + 10017.

It is an arithmetic number, because the mean of its divisors is an integer number (2781135).

Almost surely, 2^20994173 is an apocalyptic number.

It is an amenable number.

20994173 is a deficient number, since it is larger than the sum of its proper divisors (1254907).

20994173 is a wasteful number, since it uses less digits than its factorization.

20994173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17727.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 20994173 is about 4581.9398730232. The cubic root of 20994173 is about 275.8668974185.

The spelling of 20994173 in words is "twenty million, nine hundred ninety-four thousand, one hundred seventy-three".