22242440 has 32 divisors (see below), whose sum is σ = 54596160. Its totient is φ = 8088000.

The previous prime is 22242433. The next prime is 22242461. The reversal of 22242440 is 4424222.

It is a super-2 number, since 2×22242440² = 989452274307200, which contains 22 as substring.

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

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, 24836 + ... + 25715.

It is an arithmetic number, because the mean of its divisors is an integer number (1706130).

Almost surely, 2^22242440 is an apocalyptic number.

22242440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22242440 is an abundant number, since it is smaller than the sum of its proper divisors (32353720).

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

22242440 is a wasteful number, since it uses less digits than its factorization.

22242440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50573 (or 50569 counting only the distinct ones).

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

The square root of 22242440 is about 4716.1891395490. The cubic root of 22242440 is about 281.2294575943.

Adding to 22242440 its reverse (4424222), we get a palindrome (26666662).

It can be divided in two parts, 2224 and 2440, that added together give a palindrome (4664).

The spelling of 22242440 in words is "twenty-two million, two hundred forty-two thousand, four hundred forty".