20673173 has 4 divisors (see below), whose sum is σ = 21889260. Its totient is φ = 19457088.

The previous prime is 20673157. The next prime is 20673181. The reversal of 20673173 is 37137602.

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 14922769 + 5750404 = 3863^2 + 2398^2 .

It is a cyclic number.

It is not a de Polignac number, because 20673173 - 2⁴ = 20673157 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 (20673193) 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, 608018 + ... + 608051.

It is an arithmetic number, because the mean of its divisors is an integer number (5472315).

Almost surely, 2^20673173 is an apocalyptic number.

It is an amenable number.

20673173 is a deficient number, since it is larger than the sum of its proper divisors (1216087).

20673173 is a wasteful number, since it uses less digits than its factorization.

20673173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216086.

The product of its (nonzero) digits is 5292, while the sum is 29.

The square root of 20673173 is about 4546.7761106085. The cubic root of 20673173 is about 274.4536723840.

The spelling of 20673173 in words is "twenty million, six hundred seventy-three thousand, one hundred seventy-three".