25271220 has 96 divisors (see below), whose sum is σ = 77051520. Its totient is φ = 6151680.

The previous prime is 25271219. The next prime is 25271221. The reversal of 25271220 is 2217252.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25271219) and next prime (25271221).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25271221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139530 + ... + 139710.

It is an arithmetic number, because the mean of its divisors is an integer number (802620).

Almost surely, 2^25271220 is an apocalyptic number.

25271220 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 25271220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38525760).

25271220 is an abundant number, since it is smaller than the sum of its proper divisors (51780300).

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

25271220 is a wasteful number, since it uses less digits than its factorization.

25271220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 25271220 is about 5027.0488360469. The cubic root of 25271220 is about 293.4553756402.

Adding to 25271220 its reverse (2217252), we get a palindrome (27488472).

The spelling of 25271220 in words is "twenty-five million, two hundred seventy-one thousand, two hundred twenty".