22022220 has 96 divisors (see below), whose sum is σ = 68495616. Its totient is φ = 5241600.

The previous prime is 22022219. The next prime is 22022227. The reversal of 22022220 is 2222022.

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 = 22022196 and 22022205.

It is not an unprimeable number, because it can be changed into a prime (22022227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39987 + ... + 40533.

It is an arithmetic number, because the mean of its divisors is an integer number (713496).

Almost surely, 2^22022220 is an apocalyptic number.

22022220 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 22022220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34247808).

22022220 is an abundant number, since it is smaller than the sum of its proper divisors (46473396).

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

22022220 is a wasteful number, since it uses less digits than its factorization.

22022220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631 (or 629 counting only the distinct ones).

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

The square root of 22022220 is about 4692.7838219973. The cubic root of 22022220 is about 280.2982366479.

Adding to 22022220 its reverse (2222022), we get a palindrome (24244242).

The spelling of 22022220 in words is "twenty-two million, twenty-two thousand, two hundred twenty".