20604173 has 2 divisors, whose sum is σ = 20604174. Its totient is φ = 20604172.

The previous prime is 20604149. The next prime is 20604191. The reversal of 20604173 is 37140602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17825284 + 2778889 = 4222^2 + 1667^2 .

It is a cyclic number.

It is not a de Polignac number, because 20604173 - 2⁸ = 20603917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20604973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10302086 + 10302087.

It is an arithmetic number, because the mean of its divisors is an integer number (10302087).

Almost surely, 2^20604173 is an apocalyptic number.

It is an amenable number.

20604173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20604173 is an equidigital number, since it uses as much as digits as its factorization.

20604173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 20604173 is about 4539.1819747615. The cubic root of 20604173 is about 274.1479877930.

Adding to 20604173 its reverse (37140602), we get a palindrome (57744775).

The spelling of 20604173 in words is "twenty million, six hundred four thousand, one hundred seventy-three".