20836741 has 4 divisors (see below), whose sum is σ = 20988972. Its totient is φ = 20684512.

The previous prime is 20836721. The next prime is 20836793. The reversal of 20836741 is 14763802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9641025 + 11195716 = 3105^2 + 3346^2 .

It is a cyclic number.

It is not a de Polignac number, because 20836741 - 2⁵ = 20836709 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 pancake number, because a pancake can be divided into 20836741 parts by 6455 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20836721) 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, 75910 + ... + 76183.

It is an arithmetic number, because the mean of its divisors is an integer number (5247243).

Almost surely, 2^20836741 is an apocalyptic number.

It is an amenable number.

20836741 is a deficient number, since it is larger than the sum of its proper divisors (152231).

20836741 is a wasteful number, since it uses less digits than its factorization.

20836741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152230.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20836741 is about 4564.7279217934. The cubic root of 20836741 is about 275.1756057465.

The spelling of 20836741 in words is "twenty million, eight hundred thirty-six thousand, seven hundred forty-one".