25455220 has 48 divisors (see below), whose sum is σ = 61504128. Its totient is φ = 8668800.

The previous prime is 25455217. The next prime is 25455229. The reversal of 25455220 is 2255452.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25455229) 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, 23695 + ... + 24745.

It is an arithmetic number, because the mean of its divisors is an integer number (1281336).

Almost surely, 2^25455220 is an apocalyptic number.

25455220 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 25455220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30752064).

25455220 is an abundant number, since it is smaller than the sum of its proper divisors (36048908).

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

25455220 is a wasteful number, since it uses less digits than its factorization.

25455220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240 (or 1238 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 25455220 is about 5045.3166402120. The cubic root of 25455220 is about 294.1658711985.

The spelling of 25455220 in words is "twenty-five million, four hundred fifty-five thousand, two hundred twenty".