20487173 has 4 divisors (see below), whose sum is σ = 23413920. Its totient is φ = 17560428.

The previous prime is 20487163. The next prime is 20487211. The reversal of 20487173 is 37178402.

It is a happy number.

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 20487173 - 2⁴ = 20487157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20487113) 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, 1463363 + ... + 1463376.

It is an arithmetic number, because the mean of its divisors is an integer number (5853480).

Almost surely, 2^20487173 is an apocalyptic number.

It is an amenable number.

20487173 is a deficient number, since it is larger than the sum of its proper divisors (2926747).

20487173 is an equidigital number, since it uses as much as digits as its factorization.

20487173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2926746.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 20487173 is about 4526.2758422350. The cubic root of 20487173 is about 273.6280895562.

The spelling of 20487173 in words is "twenty million, four hundred eighty-seven thousand, one hundred seventy-three".