20236791 has 4 divisors (see below), whose sum is σ = 26982392. Its totient is φ = 13491192.

The previous prime is 20236781. The next prime is 20236793. The reversal of 20236791 is 19763202.

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

It is not a de Polignac number, because 20236791 - 2¹⁴ = 20220407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20236793) 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, 3372796 + ... + 3372801.

It is an arithmetic number, because the mean of its divisors is an integer number (6745598).

Almost surely, 2^20236791 is an apocalyptic number.

20236791 is a deficient number, since it is larger than the sum of its proper divisors (6745601).

20236791 is an equidigital number, since it uses as much as digits as its factorization.

20236791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6745600.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 20236791 is about 4498.5320939169. The cubic root of 20236791 is about 272.5088109824.

Adding to 20236791 its reverse (19763202), we get a palindrome (39999993).

The spelling of 20236791 in words is "twenty million, two hundred thirty-six thousand, seven hundred ninety-one".