22220440 has 48 divisors (see below), whose sum is σ = 54966240. Its totient is φ = 8078400.

The previous prime is 22220431. The next prime is 22220447. The reversal of 22220440 is 4402222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220447) 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 11 ways as a sum of consecutive naturals, for example, 2545 + ... + 7135.

It is an arithmetic number, because the mean of its divisors is an integer number (1145130).

Almost surely, 2^22220440 is an apocalyptic number.

22220440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22220440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27483120).

22220440 is an abundant number, since it is smaller than the sum of its proper divisors (32745800).

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

22220440 is a wasteful number, since it uses less digits than its factorization.

22220440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4624 (or 4609 counting only the distinct ones).

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

The square root of 22220440 is about 4713.8561709072. The cubic root of 22220440 is about 281.1367056441.

Adding to 22220440 its reverse (4402222), we get a palindrome (26622662).

The spelling of 22220440 in words is "twenty-two million, two hundred twenty thousand, four hundred forty".