20452785 has 16 divisors (see below), whose sum is σ = 34649856. Its totient is φ = 10266368.

The previous prime is 20452781. The next prime is 20452811. The reversal of 20452785 is 58725402.

It is not a de Polignac number, because 20452785 - 2² = 20452781 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20452781) 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 15 ways as a sum of consecutive naturals, for example, 39849 + ... + 40358.

It is an arithmetic number, because the mean of its divisors is an integer number (2165616).

Almost surely, 2^20452785 is an apocalyptic number.

It is an amenable number.

20452785 is a deficient number, since it is larger than the sum of its proper divisors (14197071).

20452785 is a wasteful number, since it uses less digits than its factorization.

20452785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80232.

The product of its (nonzero) digits is 22400, while the sum is 33.

The square root of 20452785 is about 4522.4755389057. The cubic root of 20452785 is about 273.4749076550.

The spelling of 20452785 in words is "twenty million, four hundred fifty-two thousand, seven hundred eighty-five".