20111085 has 80 divisors (see below), whose sum is σ = 40144896. Its totient is φ = 9580032.

The previous prime is 20111083. The next prime is 20111087. The reversal of 20111085 is 58011102.

20111085 = 158² + 159² + ... + 400².

It is an interprime number because it is at equal distance from previous prime (20111083) and next prime (20111087).

It is not a de Polignac number, because 20111085 - 2¹ = 20111083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111081) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 158292 + ... + 158418.

Almost surely, 2^20111085 is an apocalyptic number.

It is an amenable number.

20111085 is a deficient number, since it is larger than the sum of its proper divisors (20033811).

20111085 is a wasteful number, since it uses less digits than its factorization.

20111085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 20111085 is about 4484.5384377882. The cubic root of 20111085 is about 271.9433858887.

Adding to 20111085 its reverse (58011102), we get a palindrome (78122187).

The spelling of 20111085 in words is "twenty million, one hundred eleven thousand, eighty-five".