20136985 has 8 divisors (see below), whose sum is σ = 26361216. Its totient is φ = 14645040.

The previous prime is 20136973. The next prime is 20136989. The reversal of 20136985 is 58963102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20136985 - 2⁵ = 20136953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20136985.

It is not an unprimeable number, because it can be changed into a prime (20136989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183009 + ... + 183118.

It is an arithmetic number, because the mean of its divisors is an integer number (3295152).

Almost surely, 2^20136985 is an apocalyptic number.

It is an amenable number.

20136985 is a deficient number, since it is larger than the sum of its proper divisors (6224231).

20136985 is a wasteful number, since it uses less digits than its factorization.

20136985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366143.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20136985 is about 4487.4252082904. The cubic root of 20136985 is about 272.0600762990.

It can be divided in two parts, 2013 and 6985, that added together give a palindrome (8998).

The spelling of 20136985 in words is "twenty million, one hundred thirty-six thousand, nine hundred eighty-five".