20836936 has 8 divisors (see below), whose sum is σ = 39069270. Its totient is φ = 10418464.

The previous prime is 20836931. The next prime is 20836967. The reversal of 20836936 is 63963802.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20304036 + 532900 = 4506^2 + 730^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 20836895 and 20836904.

It is not an unprimeable number, because it can be changed into a prime (20836931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1302301 + ... + 1302316.

Almost surely, 2^20836936 is an apocalyptic number.

It is an amenable number.

20836936 is a deficient number, since it is larger than the sum of its proper divisors (18232334).

20836936 is a wasteful number, since it uses less digits than its factorization.

20836936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2604623 (or 2604619 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 20836936 is about 4564.7492811763. The cubic root of 20836936 is about 275.1764641514.

The spelling of 20836936 in words is "twenty million, eight hundred thirty-six thousand, nine hundred thirty-six".