22881720 has 64 divisors (see below), whose sum is σ = 70871040. Its totient is φ = 5904000.

The previous prime is 22881707. The next prime is 22881721. The reversal of 22881720 is 2718822.

It is a happy number.

It is a super-2 number, since 2×22881720² = 1047146220316800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22881721) 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 15 ways as a sum of consecutive naturals, for example, 645 + ... + 6795.

It is an arithmetic number, because the mean of its divisors is an integer number (1107360).

Almost surely, 2^22881720 is an apocalyptic number.

22881720 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 22881720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35435520).

22881720 is an abundant number, since it is smaller than the sum of its proper divisors (47989320).

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

22881720 is a wasteful number, since it uses less digits than its factorization.

22881720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6196 (or 6192 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 22881720 is about 4783.4840858939. The cubic root of 22881720 is about 283.8983634195.

The spelling of 22881720 in words is "twenty-two million, eight hundred eighty-one thousand, seven hundred twenty".