20044985 has 4 divisors (see below), whose sum is σ = 24053988. Its totient is φ = 16035984.

The previous prime is 20044979. The next prime is 20044987. The reversal of 20044985 is 58944002.

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 15085456 + 4959529 = 3884^2 + 2227^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20044985 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20044987) 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, 2004494 + ... + 2004503.

It is an arithmetic number, because the mean of its divisors is an integer number (6013497).

Almost surely, 2^20044985 is an apocalyptic number.

It is an amenable number.

20044985 is a deficient number, since it is larger than the sum of its proper divisors (4009003).

20044985 is an equidigital number, since it uses as much as digits as its factorization.

20044985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4009002.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20044985 is about 4477.1626059369. The cubic root of 20044985 is about 271.6451227265.

Adding to 20044985 its reverse (58944002), we get a palindrome (78988987).

The spelling of 20044985 in words is "twenty million, forty-four thousand, nine hundred eighty-five".