22220442 has 24 divisors (see below), whose sum is σ = 49320180. Its totient is φ = 7225920.

The previous prime is 22220431. The next prime is 22220447. The reversal of 22220442 is 24402222.

22220442 is a `hidden beast` number, since 2 + 2 + 220 + 442 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19527561 + 2692881 = 4419^2 + 1641^2 .

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

It is not an unprimeable number, because it can be changed into a prime (22220447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14317 + ... + 15792.

Almost surely, 2^22220442 is an apocalyptic number.

22220442 is an abundant number, since it is smaller than the sum of its proper divisors (27099738).

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

22220442 is a wasteful number, since it uses less digits than its factorization.

22220442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30158 (or 30155 counting only the distinct ones).

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

The square root of 22220442 is about 4713.8563830477. The cubic root of 22220442 is about 281.1367140789.

Adding to 22220442 its reverse (24402222), we get a palindrome (46622664).

The spelling of 22220442 in words is "twenty-two million, two hundred twenty thousand, four hundred forty-two".