23021856 has 216 divisors, whose sum is σ = 79135056. Its totient is φ = 6289920.

The previous prime is 23021849. The next prime is 23021861. The reversal of 23021856 is 65812032.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 535371 + ... + 535413.

It is an arithmetic number, because the mean of its divisors is an integer number (366366).

Almost surely, 2^23021856 is an apocalyptic number.

23021856 is a gapful number since it is divisible by the number (26) 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 23021856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39567528).

23021856 is an abundant number, since it is smaller than the sum of its proper divisors (56113200).

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

23021856 is a wasteful number, since it uses less digits than its factorization.

23021856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 23021856 is about 4798.1096277597. The cubic root of 23021856 is about 284.4767499839.

Adding to 23021856 its reverse (65812032), we get a palindrome (88833888).

The spelling of 23021856 in words is "twenty-three million, twenty-one thousand, eight hundred fifty-six".