25580020 has 12 divisors (see below), whose sum is σ = 53718084. Its totient is φ = 10232000.

The previous prime is 25579999. The next prime is 25580021. The reversal of 25580020 is 2008552.

It can be written as a sum of positive squares in 2 ways, for example, as 18028516 + 7551504 = 4246^2 + 2748^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25579973 and 25580000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25580021) 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, 639481 + ... + 639520.

It is an arithmetic number, because the mean of its divisors is an integer number (4476507).

Almost surely, 2^25580020 is an apocalyptic number.

25580020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25580020 is an abundant number, since it is smaller than the sum of its proper divisors (28138064).

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

25580020 is a wasteful number, since it uses less digits than its factorization.

25580020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279010 (or 1279008 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 25580020 is about 5057.6694237564. The cubic root of 25580020 is about 294.6458260298.

Adding to 25580020 its reverse (2008552), we get a palindrome (27588572).

The spelling of 25580020 in words is "twenty-five million, five hundred eighty thousand, twenty".