25820560 has 20 divisors (see below), whose sum is σ = 60032988. Its totient is φ = 10328192.

The previous prime is 25820539. The next prime is 25820567. The reversal of 25820560 is 6502852.

It can be written as a sum of positive squares in 2 ways, for example, as 18766224 + 7054336 = 4332^2 + 2656^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25820567) 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 3 ways as a sum of consecutive naturals, for example, 161299 + ... + 161458.

Almost surely, 2^25820560 is an apocalyptic number.

25820560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25820560 is an abundant number, since it is smaller than the sum of its proper divisors (34212428).

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

25820560 is a wasteful number, since it uses less digits than its factorization.

25820560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322770 (or 322764 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 25820560 is about 5081.3935096585. The cubic root of 25820560 is about 295.5665069235.

The spelling of 25820560 in words is "twenty-five million, eight hundred twenty thousand, five hundred sixty".