22731345 has 108 divisors (see below), whose sum is σ = 50444316. Its totient is φ = 9434880.

The previous prime is 22731341. The next prime is 22731367. The reversal of 22731345 is 54313722.

22731345 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 6 ways, for example, as 10870209 + 11861136 = 3297^2 + 3444^2 .

It is not a de Polignac number, because 22731345 - 2² = 22731341 is a prime.

Its product of digits (5040) is a multiple of the sum of its prime factors (112).

It is not an unprimeable number, because it can be changed into a prime (22731341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 372615 + ... + 372675.

It is an arithmetic number, because the mean of its divisors is an integer number (467077).

Almost surely, 2^22731345 is an apocalyptic number.

It is an amenable number.

22731345 is an abundant number, since it is smaller than the sum of its proper divisors (27712971).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22731345 is a wasteful number, since it uses less digits than its factorization.

22731345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112 (or 89 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 22731345 is about 4767.7400306644. The cubic root of 22731345 is about 283.2750845271.

The spelling of 22731345 in words is "twenty-two million, seven hundred thirty-one thousand, three hundred forty-five".