20803785 has 16 divisors (see below), whose sum is σ = 33377280. Its totient is φ = 11064960.

The previous prime is 20803777. The next prime is 20803789. The reversal of 20803785 is 58730802.

It is not a de Polignac number, because 20803785 - 2³ = 20803777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20803789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4440 + ... + 7830.

It is an arithmetic number, because the mean of its divisors is an integer number (2086080).

Almost surely, 2^20803785 is an apocalyptic number.

It is an amenable number.

20803785 is a deficient number, since it is larger than the sum of its proper divisors (12573495).

20803785 is a wasteful number, since it uses less digits than its factorization.

20803785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3808.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 20803785 is about 4561.1166395961. The cubic root of 20803785 is about 275.0304539276.

The spelling of 20803785 in words is "twenty million, eight hundred three thousand, seven hundred eighty-five".