20100085 has 4 divisors (see below), whose sum is σ = 24120108. Its totient is φ = 16080064.

The previous prime is 20100083. The next prime is 20100097. The reversal of 20100085 is 58000102.

It is a happy number.

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 2241009 + 17859076 = 1497^2 + 4226^2 .

It is a cyclic number.

It is not a de Polignac number, because 20100085 - 2¹ = 20100083 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2010004 + ... + 2010013.

It is an arithmetic number, because the mean of its divisors is an integer number (6030027).

Almost surely, 2^20100085 is an apocalyptic number.

It is an amenable number.

20100085 is a deficient number, since it is larger than the sum of its proper divisors (4020023).

20100085 is an equidigital number, since it uses as much as digits as its factorization.

20100085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4020022.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 20100085 is about 4483.3118339014. The cubic root of 20100085 is about 271.8937959437.

Adding to 20100085 its reverse (58000102), we get a palindrome (78100187).

The spelling of 20100085 in words is "twenty million, one hundred thousand, eighty-five".