820011 has 8 divisors (see below), whose sum is σ = 1100944. Its totient is φ = 542880.

The previous prime is 819991. The next prime is 820037. The reversal of 820011 is 110028.

It is a happy number.

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

It is not a de Polignac number, because 820011 - 2⁹ = 819499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820051) 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, 400 + ... + 1341.

It is an arithmetic number, because the mean of its divisors is an integer number (137618).

2⁸²⁰⁰¹¹ is an apocalyptic number.

820011 is a deficient number, since it is larger than the sum of its proper divisors (280933).

820011 is a wasteful number, since it uses less digits than its factorization.

820011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 820011 is about 905.5445875273. The cubic root of 820011 is about 93.5994347617.

Adding to 820011 its reverse (110028), we get a palindrome (930039).

The spelling of 820011 in words is "eight hundred twenty thousand, eleven".