25311420 has 96 divisors (see below), whose sum is σ = 82924800. Its totient is φ = 6391872.

The previous prime is 25311397. The next prime is 25311421. The reversal of 25311420 is 2411352.

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 = 25311393 and 25311402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25311421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9027 + ... + 11493.

It is an arithmetic number, because the mean of its divisors is an integer number (863800).

Almost surely, 2^25311420 is an apocalyptic number.

25311420 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 25311420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41462400).

25311420 is an abundant number, since it is smaller than the sum of its proper divisors (57613380).

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

25311420 is a wasteful number, since it uses less digits than its factorization.

25311420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2504 (or 2496 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 25311420 is about 5031.0456169667. The cubic root of 25311420 is about 293.6108971695.

Adding to 25311420 its reverse (2411352), we get a palindrome (27722772).

The spelling of 25311420 in words is "twenty-five million, three hundred eleven thousand, four hundred twenty".