20785163 has 6 divisors (see below), whose sum is σ = 24178716. Its totient is φ = 17815812.

The previous prime is 20785147. The next prime is 20785181. The reversal of 20785163 is 36158702.

It is a happy number.

It is not a de Polignac number, because 20785163 - 2⁴ = 20785147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20785103) 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 5 ways as a sum of consecutive naturals, for example, 212045 + ... + 212142.

It is an arithmetic number, because the mean of its divisors is an integer number (4029786).

Almost surely, 2^20785163 is an apocalyptic number.

20785163 is a deficient number, since it is larger than the sum of its proper divisors (3393553).

20785163 is an equidigital number, since it uses as much as digits as its factorization.

20785163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424201 (or 424194 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 20785163 is about 4559.0747964911. The cubic root of 20785163 is about 274.9483671657.

The spelling of 20785163 in words is "twenty million, seven hundred eighty-five thousand, one hundred sixty-three".