25543320 has 128 divisors (see below), whose sum is σ = 86019840. Its totient is φ = 6013440.

The previous prime is 25543319. The next prime is 25543327. The reversal of 25543320 is 2334552.

It is a super-2 number, since 2×25543320² = 1304922393244800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25543327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48579 + ... + 49101.

It is an arithmetic number, because the mean of its divisors is an integer number (672030).

Almost surely, 2^25543320 is an apocalyptic number.

25543320 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 25543320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43009920).

25543320 is an abundant number, since it is smaller than the sum of its proper divisors (60476520).

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

25543320 is a wasteful number, since it uses less digits than its factorization.

25543320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585 (or 581 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 24.

The square root of 25543320 is about 5054.0399681839. The cubic root of 25543320 is about 294.5048478058.

Adding to 25543320 its reverse (2334552), we get a palindrome (27877872).

It can be divided in two parts, 25 and 543320, that added together give a palindrome (543345).

The spelling of 25543320 in words is "twenty-five million, five hundred forty-three thousand, three hundred twenty".