25318220 has 12 divisors (see below), whose sum is σ = 53168304. Its totient is φ = 10127280.

The previous prime is 25318217. The next prime is 25318231. The reversal of 25318220 is 2281352.

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, 632936 + ... + 632975.

It is an arithmetic number, because the mean of its divisors is an integer number (4430692).

Almost surely, 2^25318220 is an apocalyptic number.

25318220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25318220 is an abundant number, since it is smaller than the sum of its proper divisors (27850084).

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

25318220 is a wasteful number, since it uses less digits than its factorization.

25318220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265920 (or 1265918 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 25318220 is about 5031.7213754341. The cubic root of 25318220 is about 293.6371880075.

Adding to 25318220 its reverse (2281352), we get a palindrome (27599572).

The spelling of 25318220 in words is "twenty-five million, three hundred eighteen thousand, two hundred twenty".