20036985 has 16 divisors (see below), whose sum is σ = 32114880. Its totient is φ = 10667840.

The previous prime is 20036983. The next prime is 20037013. The reversal of 20036985 is 58963002.

It is a happy number.

It is not a de Polignac number, because 20036985 - 2¹ = 20036983 is a prime.

It is a super-3 number, since 3×20036985³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20036983) 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, 15286 + ... + 16544.

It is an arithmetic number, because the mean of its divisors is an integer number (2007180).

Almost surely, 2^20036985 is an apocalyptic number.

It is an amenable number.

20036985 is a deficient number, since it is larger than the sum of its proper divisors (12077895).

20036985 is a wasteful number, since it uses less digits than its factorization.

20036985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2328.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 20036985 is about 4476.2690937878. The cubic root of 20036985 is about 271.6089798516.

Adding to 20036985 its reverse (58963002), we get a palindrome (78999987).

The spelling of 20036985 in words is "twenty million, thirty-six thousand, nine hundred eighty-five".