20111125 has 16 divisors (see below), whose sum is σ = 25225200. Its totient is φ = 16008000.

The previous prime is 20111093. The next prime is 20111137. The reversal of 20111125 is 52111102.

It can be written as a sum of positive squares in 8 ways, for example, as 5958481 + 14152644 = 2441^2 + 3762^2 .

It is not a de Polignac number, because 20111125 - 2⁵ = 20111093 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43395 + ... + 43855.

It is an arithmetic number, because the mean of its divisors is an integer number (1576575).

Almost surely, 2^20111125 is an apocalyptic number.

20111125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20111125 is a deficient number, since it is larger than the sum of its proper divisors (5114075).

20111125 is an equidigital number, since it uses as much as digits as its factorization.

20111125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825 (or 815 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 20111125 is about 4484.5428975538. The cubic root of 20111125 is about 271.9435661828.

Adding to 20111125 its reverse (52111102), we get a palindrome (72222227).

It can be divided in two parts, 2011 and 1125, that added together give a square (3136 = 56²).

The spelling of 20111125 in words is "twenty million, one hundred eleven thousand, one hundred twenty-five".