20856125 has 8 divisors (see below), whose sum is σ = 26028600. Its totient is φ = 16684800.

The previous prime is 20856089. The next prime is 20856131. The reversal of 20856125 is 52165802.

It can be written as a sum of positive squares in 4 ways, for example, as 1968409 + 18887716 = 1403^2 + 4346^2 .

It is not a de Polignac number, because 20856125 - 2⁶ = 20856061 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83300 + ... + 83549.

It is an arithmetic number, because the mean of its divisors is an integer number (3253575).

Almost surely, 2^20856125 is an apocalyptic number.

20856125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20856125 is a deficient number, since it is larger than the sum of its proper divisors (5172475).

20856125 is an equidigital number, since it uses as much as digits as its factorization.

20856125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166864 (or 166854 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 20856125 is about 4566.8506653929. The cubic root of 20856125 is about 275.2609094057.

The spelling of 20856125 in words is "twenty million, eight hundred fifty-six thousand, one hundred twenty-five".