22220222004 has 18 divisors (see below), whose sum is σ = 56167783490. Its totient is φ = 7406740656.

The previous prime is 22220221987. The next prime is 22220222009. The reversal of 22220222004 is 40022202222.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17450938404 + 4769283600 = 132102^2 + 69060^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220222009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 308614159 + ... + 308614230.

Almost surely, 2^22220222004 is an apocalyptic number.

It is an amenable number.

22220222004 is an abundant number, since it is smaller than the sum of its proper divisors (33947561486).

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

22220222004 is a wasteful number, since it uses less digits than its factorization.

22220222004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617228399 (or 617228394 counting only the distinct ones).

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

Adding to 22220222004 its reverse (40022202222), we get a palindrome (62242424226).

The spelling of 22220222004 in words is "twenty-two billion, two hundred twenty million, two hundred twenty-two thousand, four".