20010985 has 4 divisors (see below), whose sum is σ = 24013188. Its totient is φ = 16008784.

The previous prime is 20010967. The next prime is 20011001. The reversal of 20010985 is 58901002.

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 8156736 + 11854249 = 2856^2 + 3443^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010985 - 2¹⁷ = 19879913 is a prime.

It is a Duffinian 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, 2001094 + ... + 2001103.

It is an arithmetic number, because the mean of its divisors is an integer number (6003297).

Almost surely, 2^20010985 is an apocalyptic number.

It is an amenable number.

20010985 is a deficient number, since it is larger than the sum of its proper divisors (4002203).

20010985 is an equidigital number, since it uses as much as digits as its factorization.

20010985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4002202.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 20010985 is about 4473.3639467408. The cubic root of 20010985 is about 271.4914490262.

Adding to 20010985 its reverse (58901002), we get a palindrome (78911987).

It can be divided in two parts, 200 and 10985, that multiplied together give a cube (2197000 = 130³).

The spelling of 20010985 in words is "twenty million, ten thousand, nine hundred eighty-five".