21882480 has 80 divisors (see below), whose sum is σ = 68820000. Its totient is φ = 5750784.

The previous prime is 21882473. The next prime is 21882491. The reversal of 21882480 is 8428812.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

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, 16896 + ... + 18144.

It is an arithmetic number, because the mean of its divisors is an integer number (860250).

Almost surely, 2^21882480 is an apocalyptic number.

21882480 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 21882480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34410000).

21882480 is an abundant number, since it is smaller than the sum of its proper divisors (46937520).

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

21882480 is a wasteful number, since it uses less digits than its factorization.

21882480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338 (or 1332 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 21882480 is about 4677.8713107566. The cubic root of 21882480 is about 279.7041091954.

The spelling of 21882480 in words is "twenty-one million, eight hundred eighty-two thousand, four hundred eighty".