22551240 has 32 divisors (see below), whose sum is σ = 67654080. Its totient is φ = 6013632.

The previous prime is 22551227. The next prime is 22551251. The reversal of 22551240 is 4215522.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93844 + ... + 94083.

It is an arithmetic number, because the mean of its divisors is an integer number (2114190).

Almost surely, 2^22551240 is an apocalyptic number.

22551240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22551240 is an abundant number, since it is smaller than the sum of its proper divisors (45102840).

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

22551240 is a wasteful number, since it uses less digits than its factorization.

22551240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187941 (or 187937 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 22551240 is about 4748.8145889264. The cubic root of 22551240 is about 282.5249514599.

Adding to 22551240 its reverse (4215522), we get a palindrome (26766762).

It can be divided in two parts, 22551 and 240, that added together give a triangular number (22791 = T₂₁₃).

The spelling of 22551240 in words is "twenty-two million, five hundred fifty-one thousand, two hundred forty".