25504020 has 36 divisors (see below), whose sum is σ = 77362740. Its totient is φ = 6801024.

The previous prime is 25503983. The next prime is 25504027. The reversal of 25504020 is 2040552.

It can be written as a sum of positive squares in 2 ways, for example, as 14653584 + 10850436 = 3828^2 + 3294^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 25503984 and 25504002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25504027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70665 + ... + 71024.

It is an arithmetic number, because the mean of its divisors is an integer number (2148965).

Almost surely, 2^25504020 is an apocalyptic number.

25504020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25504020 is an abundant number, since it is smaller than the sum of its proper divisors (51858720).

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

25504020 is a wasteful number, since it uses less digits than its factorization.

25504020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141704 (or 141699 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 25504020 is about 5050.1504928071. The cubic root of 25504020 is about 294.3537322188.

Adding to 25504020 its reverse (2040552), we get a palindrome (27544572).

The spelling of 25504020 in words is "twenty-five million, five hundred four thousand, twenty".