25509020 has 24 divisors (see below), whose sum is σ = 56389200. Its totient is φ = 9666432.

The previous prime is 25509017. The next prime is 25509053. The reversal of 25509020 is 2090552.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33185 + ... + 33944.

It is an arithmetic number, because the mean of its divisors is an integer number (2349550).

Almost surely, 2^25509020 is an apocalyptic number.

25509020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25509020 is an abundant number, since it is smaller than the sum of its proper divisors (30880180).

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

25509020 is a wasteful number, since it uses less digits than its factorization.

25509020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67157 (or 67155 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 25509020 is about 5050.6455032996. The cubic root of 25509020 is about 294.3729667354.

Adding to 25509020 its reverse (2090552), we get a palindrome (27599572).

The spelling of 25509020 in words is "twenty-five million, five hundred nine thousand, twenty".