20722173 has 8 divisors (see below), whose sum is σ = 28272288. Its totient is φ = 13493424.

The previous prime is 20722171. The next prime is 20722181. The reversal of 20722173 is 37122702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20722173 - 2¹ = 20722171 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20722171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80190 + ... + 80447.

It is an arithmetic number, because the mean of its divisors is an integer number (3534036).

Almost surely, 2^20722173 is an apocalyptic number.

It is an amenable number.

20722173 is a deficient number, since it is larger than the sum of its proper divisors (7550115).

20722173 is a wasteful number, since it uses less digits than its factorization.

20722173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160683.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 20722173 is about 4552.1613547852. The cubic root of 20722173 is about 274.6703399596.

Adding to 20722173 its reverse (37122702), we get a palindrome (57844875).

The spelling of 20722173 in words is "twenty million, seven hundred twenty-two thousand, one hundred seventy-three".