22240420 has 24 divisors (see below), whose sum is σ = 49452984. Its totient is φ = 8372736.

The previous prime is 22240397. The next prime is 22240429. The reversal of 22240420 is 2404222.

It can be written as a sum of positive squares in 4 ways, for example, as 2509056 + 19731364 = 1584^2 + 4442^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22240394 and 22240403.

It is not an unprimeable number, because it can be changed into a prime (22240429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32367 + ... + 33046.

It is an arithmetic number, because the mean of its divisors is an integer number (2060541).

Almost surely, 2^22240420 is an apocalyptic number.

22240420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22240420 is an abundant number, since it is smaller than the sum of its proper divisors (27212564).

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

22240420 is a wasteful number, since it uses less digits than its factorization.

22240420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65439 (or 65437 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 22240420 is about 4715.9749787292. The cubic root of 22240420 is about 281.2209438296.

Adding to 22240420 its reverse (2404222), we get a palindrome (24644642).

It can be divided in two parts, 2 and 2240420, that added together give a palindrome (2240422).

The spelling of 22240420 in words is "twenty-two million, two hundred forty thousand, four hundred twenty".