820019 has 8 divisors (see below), whose sum is σ = 866592. Its totient is φ = 774400.

The previous prime is 819991. The next prime is 820037. The reversal of 820019 is 910028.

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 820019 - 2¹² = 815923 is a prime.

It is a super-2 number, since 2×820019² = 1344862320722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (820319) 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, 2147 + ... + 2499.

It is an arithmetic number, because the mean of its divisors is an integer number (108324).

2⁸²⁰⁰¹⁹ is an apocalyptic number.

820019 is a deficient number, since it is larger than the sum of its proper divisors (46573).

820019 is a wasteful number, since it uses less digits than its factorization.

820019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 820019 is about 905.5490047479. The cubic root of 820019 is about 93.5997391451.

Subtracting 820019 from its reverse (910028), we obtain a palindrome (90009).

The spelling of 820019 in words is "eight hundred twenty thousand, nineteen".