22442220 has 36 divisors (see below), whose sum is σ = 68075280. Its totient is φ = 5984544.

The previous prime is 22442219. The next prime is 22442237. The reversal of 22442220 is 2224422.

22442220 is a `hidden beast` number, since 2 + 2 + 442 + 220 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 22442193 and 22442202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62160 + ... + 62519.

It is an arithmetic number, because the mean of its divisors is an integer number (1890980).

Almost surely, 2^22442220 is an apocalyptic number.

22442220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22442220 is an abundant number, since it is smaller than the sum of its proper divisors (45633060).

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

22442220 is a wasteful number, since it uses less digits than its factorization.

22442220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124694 (or 124689 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 22442220 is about 4737.3220283194. The cubic root of 22442220 is about 282.0689434572.

Adding to 22442220 its reverse (2224422), we get a palindrome (24666642).

The spelling of 22442220 in words is "twenty-two million, four hundred forty-two thousand, two hundred twenty".