22222420 has 48 divisors (see below), whose sum is σ = 51565248. Its totient is φ = 7976960.

The previous prime is 22222411. The next prime is 22222427. The reversal of 22222420 is 2422222.

It is a junction number, because it is equal to n+sod(n) for n = 22222394 and 22222403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222427) 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 15 ways as a sum of consecutive naturals, for example, 17652 + ... + 18868.

It is an arithmetic number, because the mean of its divisors is an integer number (1074276).

Almost surely, 2^22222420 is an apocalyptic number.

22222420 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 22222420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25782624).

22222420 is an abundant number, since it is smaller than the sum of its proper divisors (29342828).

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

22222420 is a wasteful number, since it uses less digits than its factorization.

22222420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320 (or 1318 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 22222420 is about 4714.0661853648. The cubic root of 22222420 is about 281.1450558260.

Adding to 22222420 its reverse (2422222), we get a palindrome (24644642).

The spelling of 22222420 in words is "twenty-two million, two hundred twenty-two thousand, four hundred twenty".