20580173 has 4 divisors (see below), whose sum is σ = 21663360. Its totient is φ = 19496988.

The previous prime is 20580163. The next prime is 20580179. The reversal of 20580173 is 37108502.

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, and also an emirpimes, since its reverse is a distinct semiprime: 37108502 = 2 ⋅18554251.

It is a cyclic number.

It is not a de Polignac number, because 20580173 - 2¹⁸ = 20318029 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 (20580179) 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, 541565 + ... + 541602.

It is an arithmetic number, because the mean of its divisors is an integer number (5415840).

Almost surely, 2^20580173 is an apocalyptic number.

It is an amenable number.

20580173 is a deficient number, since it is larger than the sum of its proper divisors (1083187).

20580173 is a wasteful number, since it uses less digits than its factorization.

20580173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083186.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 20580173 is about 4536.5375563308. The cubic root of 20580173 is about 274.0415027619.

Adding to 20580173 its reverse (37108502), we get a palindrome (57688675).

The spelling of 20580173 in words is "twenty million, five hundred eighty thousand, one hundred seventy-three".