21826880 has 28 divisors (see below), whose sum is σ = 51976020. Its totient is φ = 8730624.

The previous prime is 21826867. The next prime is 21826897. The reversal of 21826880 is 8862812.

It can be written as a sum of positive squares in 2 ways, for example, as 9096256 + 12730624 = 3016^2 + 3568^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21826880.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33785 + ... + 34424.

Almost surely, 2^21826880 is an apocalyptic number.

21826880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21826880 is an abundant number, since it is smaller than the sum of its proper divisors (30149140).

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

21826880 is an equidigital number, since it uses as much as digits as its factorization.

21826880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68226 (or 68216 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 21826880 is about 4671.9246569267. The cubic root of 21826880 is about 279.4670133017.

The spelling of 21826880 in words is "twenty-one million, eight hundred twenty-six thousand, eight hundred eighty".