25443220 has 48 divisors (see below), whose sum is σ = 61725888. Its totient is φ = 8706560.

The previous prime is 25443217. The next prime is 25443227. The reversal of 25443220 is 2234452.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 25443191 and 25443200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25443227) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 339 + ... + 7141.

It is an arithmetic number, because the mean of its divisors is an integer number (1285956).

Almost surely, 2^25443220 is an apocalyptic number.

25443220 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 25443220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30862944).

25443220 is an abundant number, since it is smaller than the sum of its proper divisors (36282668).

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

25443220 is a wasteful number, since it uses less digits than its factorization.

25443220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6840 (or 6838 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 25443220 is about 5044.1272783307. The cubic root of 25443220 is about 294.1196390924.

Adding to 25443220 its reverse (2234452), we get a palindrome (27677672).

It can be divided in two parts, 254432 and 20, that added together give a palindrome (254452).

The spelling of 25443220 in words is "twenty-five million, four hundred forty-three thousand, two hundred twenty".