20181125 has 16 divisors (see below), whose sum is σ = 26670384. Its totient is φ = 15193600.

The previous prime is 20181121. The next prime is 20181131. The reversal of 20181125 is 52118102.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 9205156 + 10975969 = 3034^2 + 3313^2 .

It is not a de Polignac number, because 20181125 - 2² = 20181121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20181097 and 20181106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20181121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2624 + ... + 6873.

It is an arithmetic number, because the mean of its divisors is an integer number (1666899).

Almost surely, 2^20181125 is an apocalyptic number.

20181125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20181125 is a deficient number, since it is larger than the sum of its proper divisors (6489259).

20181125 is an equidigital number, since it uses as much as digits as its factorization.

20181125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9529 (or 9519 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 20181125 is about 4492.3407039093. The cubic root of 20181125 is about 272.2587152397.

Adding to 20181125 its reverse (52118102), we get a palindrome (72299227).

The spelling of 20181125 in words is "twenty million, one hundred eighty-one thousand, one hundred twenty-five".