25981020 has 96 divisors (see below), whose sum is σ = 87071040. Its totient is φ = 6393600.

The previous prime is 25981019. The next prime is 25981051. The reversal of 25981020 is 2018952.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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, 5170 + ... + 8870.

It is an arithmetic number, because the mean of its divisors is an integer number (906990).

Almost surely, 2^25981020 is an apocalyptic number.

25981020 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 25981020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43535520).

25981020 is an abundant number, since it is smaller than the sum of its proper divisors (61090020).

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

25981020 is a wasteful number, since it uses less digits than its factorization.

25981020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3732 (or 3724 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 25981020 is about 5097.1580316879. The cubic root of 25981020 is about 296.1775018880.

Adding to 25981020 its reverse (2018952), we get a palindrome (27999972).

The spelling of 25981020 in words is "twenty-five million, nine hundred eighty-one thousand, twenty".