25506220 has 24 divisors (see below), whose sum is σ = 53910864. Its totient is φ = 10136256.

The previous prime is 25506203. The next prime is 25506233. The reversal of 25506220 is 2260552.

It is a junction number, because it is equal to n+sod(n) for n = 25506191 and 25506200.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 922 + ... + 7201.

It is an arithmetic number, because the mean of its divisors is an integer number (2246286).

Almost surely, 2^25506220 is an apocalyptic number.

25506220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25506220 is an abundant number, since it is smaller than the sum of its proper divisors (28404644).

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

25506220 is a wasteful number, since it uses less digits than its factorization.

25506220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8289 (or 8287 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 25506220 is about 5050.3683034012. The cubic root of 25506220 is about 294.3621957158.

Adding to 25506220 its reverse (2260552), we get a palindrome (27766772).

The spelling of 25506220 in words is "twenty-five million, five hundred six thousand, two hundred twenty".