2005811740 has 24 divisors (see below), whose sum is σ = 4244364432. Its totient is φ = 796199040.

The previous prime is 2005811737. The next prime is 2005811749. The reversal of 2005811740 is 471185002.

It is a junction number, because it is equal to n+sod(n) for n = 2005811699 and 2005811708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005811749) 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, 380169 + ... + 385408.

It is an arithmetic number, because the mean of its divisors is an integer number (176848518).

Almost surely, 2^2005811740 is an apocalyptic number.

2005811740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2005811740 is an abundant number, since it is smaller than the sum of its proper divisors (2238552692).

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

2005811740 is a wasteful number, since it uses less digits than its factorization.

2005811740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765717 (or 765715 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 2005811740 is about 44786.2896431486. The cubic root of 2005811740 is about 1261.1402586294.

Adding to 2005811740 its reverse (471185002), we get a palindrome (2476996742).

The spelling of 2005811740 in words is "two billion, five million, eight hundred eleven thousand, seven hundred forty".