20002005 has 32 divisors (see below), whose sum is σ = 35769600. Its totient is φ = 10604736.

The previous prime is 20001983. The next prime is 20002007. The reversal of 20002005 is 50020002.

It is not a de Polignac number, because 20002005 - 2¹⁴ = 19985621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30592 + ... + 31238.

It is an arithmetic number, because the mean of its divisors is an integer number (1117800).

Almost surely, 2^20002005 is an apocalyptic number.

It is an amenable number.

20002005 is a deficient number, since it is larger than the sum of its proper divisors (15767595).

20002005 is a wasteful number, since it uses less digits than its factorization.

20002005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890 (or 884 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 9.

The square root of 20002005 is about 4472.3601151964. The cubic root of 20002005 is about 271.4508320353.

Adding to 20002005 its reverse (50020002), we get a palindrome (70022007).

It can be divided in two parts, 2000 and 2005, that added together give a triangular number (4005 = T₈₉).

The spelling of 20002005 in words is "twenty million, two thousand, five".