21854080 has 32 divisors (see below), whose sum is σ = 52246440. Its totient is φ = 8741376.

The previous prime is 21854059. The next prime is 21854089. The reversal of 21854080 is 8045812.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21854089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16434 + ... + 17713.

Almost surely, 2^21854080 is an apocalyptic number.

21854080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21854080 is an abundant number, since it is smaller than the sum of its proper divisors (30392360).

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

21854080 is an equidigital number, since it uses as much as digits as its factorization.

21854080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34166 (or 34154 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 21854080 is about 4674.8347564379. The cubic root of 21854080 is about 279.5830529030.

Adding to 21854080 its reverse (8045812), we get a palindrome (29899892).

The spelling of 21854080 in words is "twenty-one million, eight hundred fifty-four thousand, eighty".