25705520 has 20 divisors (see below), whose sum is σ = 59765520. Its totient is φ = 10282176.

The previous prime is 25705517. The next prime is 25705523. The reversal of 25705520 is 2550752.

It is an interprime number because it is at equal distance from previous prime (25705517) and next prime (25705523).

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

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 25705520.

It is not an unprimeable number, because it can be changed into a prime (25705523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160580 + ... + 160739.

It is an arithmetic number, because the mean of its divisors is an integer number (2988276).

Almost surely, 2^25705520 is an apocalyptic number.

25705520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25705520 is an abundant number, since it is smaller than the sum of its proper divisors (34060000).

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

25705520 is a wasteful number, since it uses less digits than its factorization.

25705520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321332 (or 321326 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 26.

The square root of 25705520 is about 5070.0611436155. The cubic root of 25705520 is about 295.1269012582.

The spelling of 25705520 in words is "twenty-five million, seven hundred five thousand, five hundred twenty".