20036681 has 8 divisors (see below), whose sum is σ = 23019264. Its totient is φ = 17084160.

The previous prime is 20036677. The next prime is 20036689. The reversal of 20036681 is 18663002.

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

It is a cyclic number.

It is not a de Polignac number, because 20036681 - 2² = 20036677 is a prime.

It is a super-2 number, since 2×20036681² = 802937170991522, which contains 22 as substring.

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 20036681.

It is not an unprimeable number, because it can be changed into a prime (20036689) 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, 6065 + ... + 8766.

It is an arithmetic number, because the mean of its divisors is an integer number (2877408).

Almost surely, 2^20036681 is an apocalyptic number.

It is an amenable number.

20036681 is a deficient number, since it is larger than the sum of its proper divisors (2982583).

20036681 is a wasteful number, since it uses less digits than its factorization.

20036681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15031.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20036681 is about 4476.2351368086. The cubic root of 20036681 is about 271.6076062327.

Adding to 20036681 its reverse (18663002), we get a palindrome (38699683).

The spelling of 20036681 in words is "twenty million, thirty-six thousand, six hundred eighty-one".