20120825 has 6 divisors (see below), whose sum is σ = 24949854. Its totient is φ = 16096640.

The previous prime is 20120819. The next prime is 20120827. The reversal of 20120825 is 52802102.

It can be written as a sum of positive squares in 3 ways, for example, as 238144 + 19882681 = 488^2 + 4459^2 .

It is not a de Polignac number, because 20120825 - 2¹⁶ = 20055289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20120797 and 20120806.

It is not an unprimeable number, because it can be changed into a prime (20120827) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 402392 + ... + 402441.

It is an arithmetic number, because the mean of its divisors is an integer number (4158309).

Almost surely, 2^20120825 is an apocalyptic number.

20120825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20120825 is a deficient number, since it is larger than the sum of its proper divisors (4829029).

20120825 is an equidigital number, since it uses as much as digits as its factorization.

20120825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804843 (or 804838 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 20120825 is about 4485.6242597882. The cubic root of 20120825 is about 271.9872804389.

Adding to 20120825 its reverse (52802102), we get a palindrome (72922927).

The spelling of 20120825 in words is "twenty million, one hundred twenty thousand, eight hundred twenty-five".