25090820 has 12 divisors (see below), whose sum is σ = 52690764. Its totient is φ = 10036320.

The previous prime is 25090799. The next prime is 25090831. The reversal of 25090820 is 2809052.

It can be written as a sum of positive squares in 2 ways, for example, as 5607424 + 19483396 = 2368^2 + 4414^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25090820.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 627251 + ... + 627290.

It is an arithmetic number, because the mean of its divisors is an integer number (4390897).

Almost surely, 2^25090820 is an apocalyptic number.

25090820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25090820 is an abundant number, since it is smaller than the sum of its proper divisors (27599944).

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

25090820 is a wasteful number, since it uses less digits than its factorization.

25090820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254550 (or 1254548 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 25090820 is about 5009.0737666758. The cubic root of 25090820 is about 292.7554249731.

Adding to 25090820 its reverse (2809052), we get a palindrome (27899872).

The spelling of 25090820 in words is "twenty-five million, ninety thousand, eight hundred twenty".