20830085 has 4 divisors (see below), whose sum is σ = 24996108. Its totient is φ = 16664064.

The previous prime is 20830067. The next prime is 20830133. The reversal of 20830085 is 58003802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13786369 + 7043716 = 3713^2 + 2654^2 .

It is a cyclic number.

It is not a de Polignac number, because 20830085 - 2⁶ = 20830021 is a prime.

It is a super-2 number, since 2×20830085² = 867784882214450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2083004 + ... + 2083013.

It is an arithmetic number, because the mean of its divisors is an integer number (6249027).

Almost surely, 2^20830085 is an apocalyptic number.

It is an amenable number.

20830085 is a deficient number, since it is larger than the sum of its proper divisors (4166023).

20830085 is an equidigital number, since it uses as much as digits as its factorization.

20830085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166022.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 20830085 is about 4563.9987949166. The cubic root of 20830085 is about 275.1463023174.

Adding to 20830085 its reverse (58003802), we get a palindrome (78833887).

The spelling of 20830085 in words is "twenty million, eight hundred thirty thousand, eighty-five".