20027791 has 4 divisors (see below), whose sum is σ = 22888912. Its totient is φ = 17166672.

The previous prime is 20027789. The next prime is 20027801. The reversal of 20027791 is 19772002.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20027791 - 2¹ = 20027789 is a prime.

It is a super-2 number, since 2×20027791² = 802224824679362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20027701) 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 in 3 ways as a sum of consecutive naturals, for example, 1430550 + ... + 1430563.

It is an arithmetic number, because the mean of its divisors is an integer number (5722228).

Almost surely, 2^20027791 is an apocalyptic number.

20027791 is a deficient number, since it is larger than the sum of its proper divisors (2861121).

20027791 is an equidigital number, since it uses as much as digits as its factorization.

20027791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861120.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 20027791 is about 4475.2420046295. The cubic root of 20027791 is about 271.5674307696.

Adding to 20027791 its reverse (19772002), we get a palindrome (39799793).

The spelling of 20027791 in words is "twenty million, twenty-seven thousand, seven hundred ninety-one".