25304220 has 72 divisors (see below), whose sum is σ = 77195664. Its totient is φ = 6709248.

The previous prime is 25304197. The next prime is 25304221. The reversal of 25304220 is 2240352.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 25304193 and 25304202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25304221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45987 + ... + 46533.

It is an arithmetic number, because the mean of its divisors is an integer number (1072162).

Almost surely, 2^25304220 is an apocalyptic number.

25304220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25304220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38597832).

25304220 is an abundant number, since it is smaller than the sum of its proper divisors (51891444).

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

25304220 is a wasteful number, since it uses less digits than its factorization.

25304220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 25304220 is about 5030.3300090551. The cubic root of 25304220 is about 293.5830546786.

Adding to 25304220 its reverse (2240352), we get a palindrome (27544572).

The spelling of 25304220 in words is "twenty-five million, three hundred four thousand, two hundred twenty".