21846480 has 80 divisors (see below), whose sum is σ = 68192064. Its totient is φ = 5785600.

The previous prime is 21846469. The next prime is 21846497. The reversal of 21846480 is 8464812.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54280 + ... + 54680.

Almost surely, 2^21846480 is an apocalyptic number.

21846480 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 21846480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34096032).

21846480 is an abundant number, since it is smaller than the sum of its proper divisors (46345584).

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

21846480 is a wasteful number, since it uses less digits than its factorization.

21846480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644 (or 638 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 21846480 is about 4674.0218227989. The cubic root of 21846480 is about 279.5506397707.

The spelling of 21846480 in words is "twenty-one million, eight hundred forty-six thousand, four hundred eighty".