22045140 has 72 divisors (see below), whose sum is σ = 72021768. Its totient is φ = 5425920.

The previous prime is 22045099. The next prime is 22045147. The reversal of 22045140 is 4154022.

It can be written as a sum of positive squares in 4 ways, for example, as 30276 + 22014864 = 174^2 + 4692^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22045147) 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, 2371 + ... + 7050.

Almost surely, 2^22045140 is an apocalyptic number.

22045140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22045140 is an abundant number, since it is smaller than the sum of its proper divisors (49976628).

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

22045140 is a wasteful number, since it uses less digits than its factorization.

22045140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9449 (or 9444 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 22045140 is about 4695.2252342140. The cubic root of 22045140 is about 280.3954446510.

Adding to 22045140 its reverse (4154022), we get a palindrome (26199162).

The spelling of 22045140 in words is "twenty-two million, forty-five thousand, one hundred forty".