22220400 has 60 divisors (see below), whose sum is σ = 71183192. Its totient is φ = 5925120.

The previous prime is 22220399. The next prime is 22220417. The reversal of 22220400 is 402222.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

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

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 8059 + ... + 10458.

Almost surely, 2^22220400 is an apocalyptic number.

22220400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22220400 is an abundant number, since it is smaller than the sum of its proper divisors (48962792).

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

22220400 is a wasteful number, since it uses less digits than its factorization.

22220400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18538 (or 18527 counting only the distinct ones).

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

The square root of 22220400 is about 4713.8519280945. The cubic root of 22220400 is about 281.1365369485.

Adding to 22220400 its reverse (402222), we get a palindrome (22622622).

The spelling of 22220400 in words is "twenty-two million, two hundred twenty thousand, four hundred".