22113840 has 80 divisors (see below), whose sum is σ = 78352128. Its totient is φ = 5054208.

The previous prime is 22113823. The next prime is 22113887. The reversal of 22113840 is 4831122.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (21).

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 15 ways as a sum of consecutive naturals, for example, 4902 + ... + 8261.

Almost surely, 2^22113840 is an apocalyptic number.

22113840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22113840 is an abundant number, since it is smaller than the sum of its proper divisors (56238288).

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

22113840 is a wasteful number, since it uses less digits than its factorization.

22113840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13186 (or 13180 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 22113840 is about 4702.5354863095. The cubic root of 22113840 is about 280.6864111478.

Adding to 22113840 its reverse (4831122), we get a palindrome (26944962).

The spelling of 22113840 in words is "twenty-two million, one hundred thirteen thousand, eight hundred forty".