20006771 has 4 divisors (see below), whose sum is σ = 20059392. Its totient is φ = 19954152.

The previous prime is 20006743. The next prime is 20006797. The reversal of 20006771 is 17760002.

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 20006771 - 2¹⁴ = 19990387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20006731) 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, 25736 + ... + 26501.

It is an arithmetic number, because the mean of its divisors is an integer number (5014848).

Almost surely, 2^20006771 is an apocalyptic number.

20006771 is a deficient number, since it is larger than the sum of its proper divisors (52621).

20006771 is an equidigital number, since it uses as much as digits as its factorization.

20006771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52620.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 20006771 is about 4472.8929117519. The cubic root of 20006771 is about 271.4723904061.

Adding to 20006771 its reverse (17760002), we get a palindrome (37766773).

The spelling of 20006771 in words is "twenty million, six thousand, seven hundred seventy-one".