20005766 has 16 divisors (see below), whose sum is σ = 33866640. Its totient is φ = 8779680.

The previous prime is 20005763. The next prime is 20005807. The reversal of 20005766 is 66750002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15041 + ... + 16316.

It is an arithmetic number, because the mean of its divisors is an integer number (2116665).

Almost surely, 2^20005766 is an apocalyptic number.

20005766 is a deficient number, since it is larger than the sum of its proper divisors (13860874).

20005766 is a wasteful number, since it uses less digits than its factorization.

20005766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31399.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20005766 is about 4472.7805669404. The cubic root of 20005766 is about 271.4678447064.

Adding to 20005766 its reverse (66750002), we get a palindrome (86755768).

The spelling of 20005766 in words is "twenty million, five thousand, seven hundred sixty-six".