22424240 has 20 divisors (see below), whose sum is σ = 52136544. Its totient is φ = 8969664.

The previous prime is 22424239. The next prime is 22424249. The reversal of 22424240 is 4242422.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (22424249) 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, 140072 + ... + 140231.

Almost surely, 2^22424240 is an apocalyptic number.

22424240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22424240 is an abundant number, since it is smaller than the sum of its proper divisors (29712304).

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

22424240 is a wasteful number, since it uses less digits than its factorization.

22424240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280316 (or 280310 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 22424240 is about 4735.4239514536. The cubic root of 22424240 is about 281.9935950795.

Adding to 22424240 its reverse (4242422), we get a palindrome (26666662).

It can be divided in two parts, 2 and 2424240, that added together give a palindrome (2424242).

The spelling of 22424240 in words is "twenty-two million, four hundred twenty-four thousand, two hundred forty".