820540163 has 4 divisors (see below), whose sum is σ = 820794288. Its totient is φ = 820286040.

The previous prime is 820540153. The next prime is 820540177. The reversal of 820540163 is 361045028.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 820540163 - 2²⁶ = 753431299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820540103) 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 3 ways as a sum of consecutive naturals, for example, 122156 + ... + 128697.

It is an arithmetic number, because the mean of its divisors is an integer number (205198572).

Almost surely, 2^820540163 is an apocalyptic number.

820540163 is a deficient number, since it is larger than the sum of its proper divisors (254125).

820540163 is a wasteful number, since it uses less digits than its factorization.

820540163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254124.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 820540163 is about 28645.0722289192. The cubic root of 820540163 is about 936.1956404761.

The spelling of 820540163 in words is "eight hundred twenty million, five hundred forty thousand, one hundred sixty-three".