22720173 has 24 divisors (see below), whose sum is σ = 35546112. Its totient is φ = 12870144.

The previous prime is 22720127. The next prime is 22720189. The reversal of 22720173 is 37102722.

It is not a de Polignac number, because 22720173 - 2¹⁰ = 22719149 is a prime.

It is a super-2 number, since 2×22720173² = 1032412522299858, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22720073) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18061 + ... + 19277.

It is an arithmetic number, because the mean of its divisors is an integer number (1481088).

Almost surely, 2^22720173 is an apocalyptic number.

It is an amenable number.

22720173 is a deficient number, since it is larger than the sum of its proper divisors (12825939).

22720173 is a wasteful number, since it uses less digits than its factorization.

22720173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361 (or 1354 counting only the distinct ones).

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

The square root of 22720173 is about 4766.5682623875. The cubic root of 22720173 is about 283.2286689153.

Adding to 22720173 its reverse (37102722), we get a palindrome (59822895).

The spelling of 22720173 in words is "twenty-two million, seven hundred twenty thousand, one hundred seventy-three".