20840325 has 24 divisors (see below), whose sum is σ = 37589856. Its totient is φ = 10104000.

The previous prime is 20840311. The next prime is 20840363. The reversal of 20840325 is 52304802.

It is not a de Polignac number, because 20840325 - 2⁵ = 20840293 is a prime.

It is a super-2 number, since 2×20840325² = 868638292211250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20840295 and 20840304.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11806 + ... + 13455.

It is an arithmetic number, because the mean of its divisors is an integer number (1566244).

Almost surely, 2^20840325 is an apocalyptic number.

20840325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20840325 is a deficient number, since it is larger than the sum of its proper divisors (16749531).

20840325 is a wasteful number, since it uses less digits than its factorization.

20840325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25285 (or 25280 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 20840325 is about 4565.1204803378. The cubic root of 20840325 is about 275.1913819314.

The spelling of 20840325 in words is "twenty million, eight hundred forty thousand, three hundred twenty-five".