22551420 has 24 divisors (see below), whose sum is σ = 63144144. Its totient is φ = 6013696.

The previous prime is 22551413. The next prime is 22551437. The reversal of 22551420 is 2415522.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 187869 + ... + 187988.

It is an arithmetic number, because the mean of its divisors is an integer number (2631006).

Almost surely, 2^22551420 is an apocalyptic number.

22551420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22551420 is an abundant number, since it is smaller than the sum of its proper divisors (40592724).

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

22551420 is a wasteful number, since it uses less digits than its factorization.

22551420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375869 (or 375867 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 22551420 is about 4748.8335409867. The cubic root of 22551420 is about 282.5257031460.

Adding to 22551420 its reverse (2415522), we get a palindrome (24966942).

The spelling of 22551420 in words is "twenty-two million, five hundred fifty-one thousand, four hundred twenty".