22081842 has 16 divisors (see below), whose sum is σ = 49070880. Its totient is φ = 7360596.

The previous prime is 22081841. The next prime is 22081849. The reversal of 22081842 is 24818022.

It is a super-2 number, since 2×22081842² = 975215492225928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (22081841) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 204408 + ... + 204515.

It is an arithmetic number, because the mean of its divisors is an integer number (3066930).

Almost surely, 2^22081842 is an apocalyptic number.

22081842 is an abundant number, since it is smaller than the sum of its proper divisors (26989038).

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

22081842 is a wasteful number, since it uses less digits than its factorization.

22081842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408934 (or 408928 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 22081842 is about 4699.1320475169. The cubic root of 22081842 is about 280.5509644592.

Adding to 22081842 its reverse (24818022), we get a palindrome (46899864).

The spelling of 22081842 in words is "twenty-two million, eighty-one thousand, eight hundred forty-two".