22222222220 has 96 divisors (see below), whose sum is σ = 52348972032. Its totient is φ = 7853760000.

The previous prime is 22222222189. The next prime is 22222222223. The reversal of 22222222220 is 2222222222.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 22222222192 and 22222222201.

It is not an unprimeable number, because it can be changed into a prime (22222222223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2439875 + ... + 2448965.

It is an arithmetic number, because the mean of its divisors is an integer number (545301792).

Almost surely, 2^22222222220 is an apocalyptic number.

22222222220 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 22222222220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26174486016).

22222222220 is an abundant number, since it is smaller than the sum of its proper divisors (30126749812).

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

22222222220 is a wasteful number, since it uses less digits than its factorization.

22222222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9423 (or 9421 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

22222222220 divided by its sum of digits (20) gives a palindrome (1111111111).

Adding to 22222222220 its reverse (2222222222), we get a palindrome (24444444442).

It can be divided in two parts, 222222 and 22220, that added together give a palindrome (244442).

The spelling of 22222222220 in words is "twenty-two billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty".