21848020 has 48 divisors (see below), whose sum is σ = 47980800. Its totient is φ = 8346240.

The previous prime is 21847993. The next prime is 21848023. The reversal of 21848020 is 2084812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21848023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80485 + ... + 80755.

It is an arithmetic number, because the mean of its divisors is an integer number (999600).

Almost surely, 2^21848020 is an apocalyptic number.

21848020 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 21848020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23990400).

21848020 is an abundant number, since it is smaller than the sum of its proper divisors (26132780).

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

21848020 is a wasteful number, since it uses less digits than its factorization.

21848020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448 (or 446 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 21848020 is about 4674.1865602477. The cubic root of 21848020 is about 279.5572083021.

The spelling of 21848020 in words is "twenty-one million, eight hundred forty-eight thousand, twenty".