22011864 has 32 divisors (see below), whose sum is σ = 62891520. Its totient is φ = 6289056.

The previous prime is 22011863. The next prime is 22011877. The reversal of 22011864 is 46811022.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22011863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65344 + ... + 65679.

It is an arithmetic number, because the mean of its divisors is an integer number (1965360).

Almost surely, 2^22011864 is an apocalyptic number.

22011864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

22011864 is an abundant number, since it is smaller than the sum of its proper divisors (40879656).

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

22011864 is a wasteful number, since it uses less digits than its factorization.

22011864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131039 (or 131035 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 22011864 is about 4691.6802960134. The cubic root of 22011864 is about 280.2542927938.

Adding to 22011864 its reverse (46811022), we get a palindrome (68822886).

The spelling of 22011864 in words is "twenty-two million, eleven thousand, eight hundred sixty-four".