20736236 has 24 divisors (see below), whose sum is σ = 37040640. Its totient is φ = 10155600.

The previous prime is 20736217. The next prime is 20736251. The reversal of 20736236 is 63263702.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20736199 and 20736208.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 66521 + ... + 66831.

It is an arithmetic number, because the mean of its divisors is an integer number (1543360).

Almost surely, 2^20736236 is an apocalyptic number.

It is an amenable number.

20736236 is a deficient number, since it is larger than the sum of its proper divisors (16304404).

20736236 is a wasteful number, since it uses less digits than its factorization.

20736236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605 (or 603 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 29.

The square root of 20736236 is about 4553.7057436773. The cubic root of 20736236 is about 274.7324604641.

Adding to 20736236 its reverse (63263702), we get a palindrome (83999938).

The spelling of 20736236 in words is "twenty million, seven hundred thirty-six thousand, two hundred thirty-six".