25312420 has 72 divisors (see below), whose sum is σ = 64580544. Its totient is φ = 8293824.

The previous prime is 25312387. The next prime is 25312451. The reversal of 25312420 is 2421352.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21979 + ... + 23101.

It is an arithmetic number, because the mean of its divisors is an integer number (896952).

Almost surely, 2^25312420 is an apocalyptic number.

25312420 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 25312420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32290272).

25312420 is an abundant number, since it is smaller than the sum of its proper divisors (39268124).

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

25312420 is a wasteful number, since it uses less digits than its factorization.

25312420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169 (or 1160 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 25312420 is about 5031.1449989043. The cubic root of 25312420 is about 293.6147637645.

Adding to 25312420 its reverse (2421352), we get a palindrome (27733772).

It can be divided in two parts, 25 and 312420, that added together give a triangular number (312445 = T₇₉₀).

The spelling of 25312420 in words is "twenty-five million, three hundred twelve thousand, four hundred twenty".