22351240 has 16 divisors (see below), whose sum is σ = 50290380. Its totient is φ = 8940480.

The previous prime is 22351237. The next prime is 22351247. The reversal of 22351240 is 4215322.

It can be written as a sum of positive squares in 2 ways, for example, as 19873764 + 2477476 = 4458^2 + 1574^2 .

It is not an unprimeable number, because it can be changed into a prime (22351247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279351 + ... + 279430.

Almost surely, 2^22351240 is an apocalyptic number.

22351240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22351240 is an abundant number, since it is smaller than the sum of its proper divisors (27939140).

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

22351240 is a wasteful number, since it uses less digits than its factorization.

22351240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558792 (or 558788 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 22351240 is about 4727.7098049690. The cubic root of 22351240 is about 281.6872612339.

Adding to 22351240 its reverse (4215322), we get a palindrome (26566562).

The spelling of 22351240 in words is "twenty-two million, three hundred fifty-one thousand, two hundred forty".