20662173 has 18 divisors (see below), whose sum is σ = 34718814. Its totient is φ = 11806704.

The previous prime is 20662171. The next prime is 20662183. The reversal of 20662173 is 37126602.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16426809 + 4235364 = 4053^2 + 2058^2 .

It is not a de Polignac number, because 20662173 - 2¹ = 20662171 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20662171) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 22986 + ... + 23867.

It is an arithmetic number, because the mean of its divisors is an integer number (1928823).

Almost surely, 2^20662173 is an apocalyptic number.

It is an amenable number.

20662173 is a deficient number, since it is larger than the sum of its proper divisors (14056641).

20662173 is a wasteful number, since it uses less digits than its factorization.

20662173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46873 (or 46863 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20662173 is about 4545.5663013534. The cubic root of 20662173 is about 274.4049856792.

Adding to 20662173 its reverse (37126602), we get a palindrome (57788775).

The spelling of 20662173 in words is "twenty million, six hundred sixty-two thousand, one hundred seventy-three".