22144340 has 12 divisors (see below), whose sum is σ = 46503156. Its totient is φ = 8857728.

The previous prime is 22144333. The next prime is 22144361. The reversal of 22144340 is 4344122.

It can be written as a sum of positive squares in 2 ways, for example, as 4268356 + 17875984 = 2066^2 + 4228^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1107217 = 22144340 / (2 + 2 + 1 + 4 + 4 + 3 + 4 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553589 + ... + 553628.

It is an arithmetic number, because the mean of its divisors is an integer number (3875263).

Almost surely, 2^22144340 is an apocalyptic number.

22144340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22144340 is an abundant number, since it is smaller than the sum of its proper divisors (24358816).

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

22144340 is a wasteful number, since it uses less digits than its factorization.

22144340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107226 (or 1107224 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 22144340 is about 4705.7773002980. Note that the first 3 decimals coincide. The cubic root of 22144340 is about 280.8153952701.

Adding to 22144340 its reverse (4344122), we get a palindrome (26488462).

The spelling of 22144340 in words is "twenty-two million, one hundred forty-four thousand, three hundred forty".