22222220 has 24 divisors (see below), whose sum is σ = 46872000. Its totient is φ = 8849792.

The previous prime is 22222199. The next prime is 22222223. The reversal of 22222220 is 2222222.

It is a happy number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 22222195 and 22222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222223) 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 7 ways as a sum of consecutive naturals, for example, 2456 + ... + 7104.

It is an arithmetic number, because the mean of its divisors is an integer number (1953000).

Almost surely, 2^22222220 is an apocalyptic number.

22222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22222220 is an abundant number, since it is smaller than the sum of its proper divisors (24649780).

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

22222220 is a wasteful number, since it uses less digits than its factorization.

22222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4897 (or 4895 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 22222220 is about 4714.0449722081. The cubic root of 22222220 is about 281.1442123958.

Adding to 22222220 its reverse (2222222), we get a palindrome (24444442).

It can be divided in two parts, 2 and 2222220, that added together give a palindrome (2222222).

The spelling of 22222220 in words is "twenty-two million, two hundred twenty-two thousand, two hundred twenty".