25890020 has 24 divisors (see below), whose sum is σ = 58551864. Its totient is φ = 9559296.

The previous prime is 25889993. The next prime is 25890043. The reversal of 25890020 is 2009852.

It can be written as a sum of positive squares in 4 ways, for example, as 2483776 + 23406244 = 1576^2 + 4838^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

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 7 ways as a sum of consecutive naturals, for example, 49529 + ... + 50048.

It is an arithmetic number, because the mean of its divisors is an integer number (2439661).

Almost surely, 2^25890020 is an apocalyptic number.

25890020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25890020 is an abundant number, since it is smaller than the sum of its proper divisors (32661844).

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

25890020 is a wasteful number, since it uses less digits than its factorization.

25890020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99599 (or 99597 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 25890020 is about 5088.2236586062. The cubic root of 25890020 is about 295.8313045332.

Adding to 25890020 its reverse (2009852), we get a palindrome (27899872).

The spelling of 25890020 in words is "twenty-five million, eight hundred ninety thousand, twenty".