22081920 has 256 divisors, whose sum is σ = 84602880. Its totient is φ = 4792320.

The previous prime is 22081907. The next prime is 22081921. The reversal of 22081920 is 2918022.

It is a super-2 number, since 2×22081920² = 975222381772800, which contains 22 as substring.

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 (22081921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 416614 + ... + 416666.

It is an arithmetic number, because the mean of its divisors is an integer number (330480).

Almost surely, 2^22081920 is an apocalyptic number.

22081920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22081920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42301440).

22081920 is an abundant number, since it is smaller than the sum of its proper divisors (62520960).

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

22081920 is a wasteful number, since it uses less digits than its factorization.

22081920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 22081920 is about 4699.1403469145. The cubic root of 22081920 is about 280.5512947902.

Adding to 22081920 its reverse (2918022), we get a palindrome (24999942).

The spelling of 22081920 in words is "twenty-two million, eighty-one thousand, nine hundred twenty".