25105520 has 80 divisors (see below), whose sum is σ = 65138688. Its totient is φ = 8920320.

The previous prime is 25105477. The next prime is 25105523. The reversal of 25105520 is 2550152.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 25105492 and 25105501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25105523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41057 + ... + 41663.

Almost surely, 2^25105520 is an apocalyptic number.

25105520 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 25105520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32569344).

25105520 is an abundant number, since it is smaller than the sum of its proper divisors (40033168).

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

25105520 is a wasteful number, since it uses less digits than its factorization.

25105520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678 (or 672 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 25105520 is about 5010.5408889660. The cubic root of 25105520 is about 292.8125861790.

Adding to 25105520 its reverse (2550152), we get a palindrome (27655672).

The spelling of 25105520 in words is "twenty-five million, one hundred five thousand, five hundred twenty".