22051240 has 16 divisors (see below), whose sum is σ = 49615380. Its totient is φ = 8820480.

The previous prime is 22051231. The next prime is 22051247. The reversal of 22051240 is 4215022.

It can be written as a sum of positive squares in 2 ways, for example, as 20448484 + 1602756 = 4522^2 + 1266^2 .

It is not an unprimeable number, because it can be changed into a prime (22051247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275601 + ... + 275680.

Almost surely, 2^22051240 is an apocalyptic number.

22051240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22051240 is an abundant number, since it is smaller than the sum of its proper divisors (27564140).

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

22051240 is a wasteful number, since it uses less digits than its factorization.

22051240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551292 (or 551288 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 22051240 is about 4695.8747853834. The cubic root of 22051240 is about 280.4213045379.

Adding to 22051240 its reverse (4215022), we get a palindrome (26266262).

The spelling of 22051240 in words is "twenty-two million, fifty-one thousand, two hundred forty".