22081420 has 24 divisors (see below), whose sum is σ = 48812400. Its totient is φ = 8367552.

The previous prime is 22081387. The next prime is 22081429. The reversal of 22081420 is 2418022.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (22081429) 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 7 ways as a sum of consecutive naturals, for example, 28675 + ... + 29434.

It is an arithmetic number, because the mean of its divisors is an integer number (2033850).

Almost surely, 2^22081420 is an apocalyptic number.

22081420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22081420 is an abundant number, since it is smaller than the sum of its proper divisors (26730980).

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

22081420 is a wasteful number, since it uses less digits than its factorization.

22081420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58137 (or 58135 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 22081420 is about 4699.0871453932. The cubic root of 22081420 is about 280.5491772704.

Adding to 22081420 its reverse (2418022), we get a palindrome (24499442).

The spelling of 22081420 in words is "twenty-two million, eighty-one thousand, four hundred twenty".