20036857 has 4 divisors (see below), whose sum is σ = 20047716. Its totient is φ = 20026000.

The previous prime is 20036851. The next prime is 20036879. The reversal of 20036857 is 75863002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2572816 + 17464041 = 1604^2 + 4179^2 .

It is a cyclic number.

It is not a de Polignac number, because 20036857 - 2⁷ = 20036729 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20036851) 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, 1894 + ... + 6607.

It is an arithmetic number, because the mean of its divisors is an integer number (5011929).

Almost surely, 2^20036857 is an apocalyptic number.

It is an amenable number.

20036857 is a deficient number, since it is larger than the sum of its proper divisors (10859).

20036857 is an equidigital number, since it uses as much as digits as its factorization.

20036857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10858.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20036857 is about 4476.2547961438. The cubic root of 20036857 is about 271.6084014875.

Adding to 20036857 its reverse (75863002), we get a palindrome (95899859).

The spelling of 20036857 in words is "twenty million, thirty-six thousand, eight hundred fifty-seven".