20512085 has 16 divisors (see below), whose sum is σ = 27043200. Its totient is φ = 14811840.

The previous prime is 20512073. The next prime is 20512087. The reversal of 20512085 is 58021502.

It is not a de Polignac number, because 20512085 - 2¹⁴ = 20495701 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20512085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20512087) 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, 6944 + ... + 9446.

It is an arithmetic number, because the mean of its divisors is an integer number (1690200).

Almost surely, 2^20512085 is an apocalyptic number.

It is an amenable number.

20512085 is a deficient number, since it is larger than the sum of its proper divisors (6531115).

20512085 is a wasteful number, since it uses less digits than its factorization.

20512085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2668.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 20512085 is about 4529.0269374337. The cubic root of 20512085 is about 273.7389534265.

Adding to 20512085 its reverse (58021502), we get a palindrome (78533587).

The spelling of 20512085 in words is "twenty million, five hundred twelve thousand, eighty-five".