2081805 has 48 divisors (see below), whose sum is σ = 3881472. Its totient is φ = 950400.

The previous prime is 2081801. The next prime is 2081809. The reversal of 2081805 is 5081802.

It is an interprime number because it is at equal distance from previous prime (2081801) and next prime (2081809).

It is not a de Polignac number, because 2081805 - 2² = 2081801 is a prime.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 56247 + ... + 56283.

It is an arithmetic number, because the mean of its divisors is an integer number (80864).

2^2081805 is an apocalyptic number.

It is an amenable number.

2081805 is a deficient number, since it is larger than the sum of its proper divisors (1799667).

2081805 is a wasteful number, since it uses less digits than its factorization.

2081805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 2081805 is about 1442.8461456441. The cubic root of 2081805 is about 127.6869997254.

The spelling of 2081805 in words is "two million, eighty-one thousand, eight hundred five".