25513220 has 12 divisors (see below), whose sum is σ = 53577804. Its totient is φ = 10205280.

The previous prime is 25513199. The next prime is 25513247. The reversal of 25513220 is 2231552.

It can be written as a sum of positive squares in 2 ways, for example, as 5299204 + 20214016 = 2302^2 + 4496^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1275661 = 25513220 / (2 + 5 + 5 + 1 + 3 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 25513192 and 25513201.

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, 637811 + ... + 637850.

It is an arithmetic number, because the mean of its divisors is an integer number (4464817).

Almost surely, 2^25513220 is an apocalyptic number.

25513220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25513220 is an abundant number, since it is smaller than the sum of its proper divisors (28064584).

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

25513220 is a wasteful number, since it uses less digits than its factorization.

25513220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275670 (or 1275668 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 25513220 is about 5051.0612746234. The cubic root of 25513220 is about 294.3891217871.

Adding to 25513220 its reverse (2231552), we get a palindrome (27744772).

The spelling of 25513220 in words is "twenty-five million, five hundred thirteen thousand, two hundred twenty".