25220 has 24 divisors (see below), whose sum is σ = 57624. Its totient is φ = 9216.

The previous prime is 25219. The next prime is 25229. The reversal of 25220 is 2252.

It can be written as a sum of positive squares in 4 ways, for example, as 256 + 24964 = 16^2 + 158^2 .

It is a plaindrome in base 7.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212 + ... + 308.

It is an arithmetic number, because the mean of its divisors is an integer number (2401).

2²⁵²²⁰ is an apocalyptic number.

25220 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 25220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28812).

25220 is an abundant number, since it is smaller than the sum of its proper divisors (32404).

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

25220 is a wasteful number, since it uses less digits than its factorization.

25220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 11.

The square root of 25220 is about 158.8080602488. The cubic root of 25220 is about 29.3256981965.

Adding to 25220 its reverse (2252), we get a palindrome (27472).

It can be divided in two parts, 252 and 20, that added together give a palindrome (272).

The spelling of 25220 in words is "twenty-five thousand, two hundred twenty".