820550813 has 8 divisors (see below), whose sum is σ = 846263040. Its totient is φ = 795024720.

The previous prime is 820550803. The next prime is 820550821. The reversal of 820550813 is 318055028.

It is a happy number.

820550813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 820550813 - 2⁸ = 820550557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 820550813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820550803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37553 + ... + 55238.

It is an arithmetic number, because the mean of its divisors is an integer number (105782880).

Almost surely, 2^820550813 is an apocalyptic number.

It is an amenable number.

820550813 is a deficient number, since it is larger than the sum of its proper divisors (25712227).

820550813 is a wasteful number, since it uses less digits than its factorization.

820550813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93067.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 820550813 is about 28645.2581241643. The cubic root of 820550813 is about 936.1996908326.

The spelling of 820550813 in words is "eight hundred twenty million, five hundred fifty thousand, eight hundred thirteen".