22220220 has 96 divisors (see below), whose sum is σ = 68656896. Its totient is φ = 5324800.

The previous prime is 22220213. The next prime is 22220227. The reversal of 22220220 is 2202222.

It is an interprime number because it is at equal distance from previous prime (22220213) and next prime (22220227).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 22220196 and 22220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220227) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 86332 + ... + 86588.

It is an arithmetic number, because the mean of its divisors is an integer number (715176).

Almost surely, 2^22220220 is an apocalyptic number.

22220220 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 22220220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34328448).

22220220 is an abundant number, since it is smaller than the sum of its proper divisors (46436676).

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

22220220 is a wasteful number, since it uses less digits than its factorization.

22220220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 22220220 is about 4713.8328353899. The cubic root of 22220220 is about 281.1357778155.

Adding to 22220220 its reverse (2202222), we get a palindrome (24422442).

It can be divided in two parts, 222202 and 20, that added together give a palindrome (222222).

The spelling of 22220220 in words is "twenty-two million, two hundred twenty thousand, two hundred twenty".