20005764 has 12 divisors (see below), whose sum is σ = 46680144. Its totient is φ = 6668584.

The previous prime is 20005763. The next prime is 20005807. The reversal of 20005764 is 46750002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 833562 + ... + 833585.

It is an arithmetic number, because the mean of its divisors is an integer number (3890012).

Almost surely, 2^20005764 is an apocalyptic number.

It is an amenable number.

20005764 is an abundant number, since it is smaller than the sum of its proper divisors (26674380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20005764 is a wasteful number, since it uses less digits than its factorization.

20005764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667154 (or 1667152 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 20005764 is about 4472.7803433659. The cubic root of 20005764 is about 271.4678356600.

Adding to 20005764 its reverse (46750002), we get a palindrome (66755766).

The spelling of 20005764 in words is "twenty million, five thousand, seven hundred sixty-four".