20736071 has 4 divisors (see below), whose sum is σ = 21177312. Its totient is φ = 20294832.

The previous prime is 20736061. The next prime is 20736077. The reversal of 20736071 is 17063702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20736071 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 20736071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20736077) 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, 220550 + ... + 220643.

It is an arithmetic number, because the mean of its divisors is an integer number (5294328).

Almost surely, 2^20736071 is an apocalyptic number.

20736071 is a deficient number, since it is larger than the sum of its proper divisors (441241).

20736071 is an equidigital number, since it uses as much as digits as its factorization.

20736071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441240.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 20736071 is about 4553.6876265286. The cubic root of 20736071 is about 274.7317317723.

Adding to 20736071 its reverse (17063702), we get a palindrome (37799773).

The spelling of 20736071 in words is "twenty million, seven hundred thirty-six thousand, seventy-one".