25512220 has 12 divisors (see below), whose sum is σ = 53575704. Its totient is φ = 10204880.

The previous prime is 25512197. The next prime is 25512241. The reversal of 25512220 is 2221552.

It is a plaindrome in base 11.

It is a congruent number.

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, 637786 + ... + 637825.

It is an arithmetic number, because the mean of its divisors is an integer number (4464642).

Almost surely, 2^25512220 is an apocalyptic number.

25512220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25512220 is an abundant number, since it is smaller than the sum of its proper divisors (28063484).

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

25512220 is a wasteful number, since it uses less digits than its factorization.

25512220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275620 (or 1275618 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 25512220 is about 5050.9622845553. The cubic root of 25512220 is about 294.3852755071.

Adding to 25512220 its reverse (2221552), we get a palindrome (27733772).

The spelling of 25512220 in words is "twenty-five million, five hundred twelve thousand, two hundred twenty".