20943173 has 4 divisors (see below), whose sum is σ = 21159180. Its totient is φ = 20727168.

The previous prime is 20943163. The next prime is 20943199. The reversal of 20943173 is 37134902.

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 2982529 + 17960644 = 1727^2 + 4238^2 .

It is a cyclic number.

It is not a de Polignac number, because 20943173 - 2⁴ = 20943157 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 (20943103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107858 + ... + 108051.

It is an arithmetic number, because the mean of its divisors is an integer number (5289795).

Almost surely, 2^20943173 is an apocalyptic number.

It is an amenable number.

20943173 is a deficient number, since it is larger than the sum of its proper divisors (216007).

20943173 is an equidigital number, since it uses as much as digits as its factorization.

20943173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216006.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 20943173 is about 4576.3711606468. The cubic root of 20943173 is about 275.6433334850.

The spelling of 20943173 in words is "twenty million, nine hundred forty-three thousand, one hundred seventy-three".