20001173 has 4 divisors (see below), whose sum is σ = 20184780. Its totient is φ = 19817568.

The previous prime is 20001161. The next prime is 20001181. The reversal of 20001173 is 37110002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16459249 + 3541924 = 4057^2 + 1882^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001173 - 2⁸ = 20000917 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 (20001073) 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 3 ways as a sum of consecutive naturals, for example, 91640 + ... + 91857.

It is an arithmetic number, because the mean of its divisors is an integer number (5046195).

Almost surely, 2^20001173 is an apocalyptic number.

It is an amenable number.

20001173 is a deficient number, since it is larger than the sum of its proper divisors (183607).

20001173 is a wasteful number, since it uses less digits than its factorization.

20001173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183606.

The product of its (nonzero) digits is 42, while the sum is 14.

The square root of 20001173 is about 4472.2670984636. The cubic root of 20001173 is about 271.4470682422.

Adding to 20001173 its reverse (37110002), we get a palindrome (57111175).

The spelling of 20001173 in words is "twenty million, one thousand, one hundred seventy-three".