20785233 has 16 divisors (see below), whose sum is σ = 32348160. Its totient is φ = 11624016.

The previous prime is 20785213. The next prime is 20785241. The reversal of 20785233 is 33258702.

It is not a de Polignac number, because 20785233 - 2⁹ = 20784721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20785233.

It is not an unprimeable number, because it can be changed into a prime (20785213) 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, 9543 + ... + 11516.

It is an arithmetic number, because the mean of its divisors is an integer number (2021760).

Almost surely, 2^20785233 is an apocalyptic number.

It is an amenable number.

20785233 is a deficient number, since it is larger than the sum of its proper divisors (11562927).

20785233 is a wasteful number, since it uses less digits than its factorization.

20785233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21116.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 20785233 is about 4559.0824734808. The cubic root of 20785233 is about 274.9486758212.

The spelling of 20785233 in words is "twenty million, seven hundred eighty-five thousand, two hundred thirty-three".