820671 has 8 divisors (see below), whose sum is σ = 1132080. Its totient is φ = 528192.

The previous prime is 820657. The next prime is 820679. The reversal of 820671 is 176028.

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

It is not a de Polignac number, because 820671 - 2¹⁰ = 819647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820679) 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, 4630 + ... + 4803.

It is an arithmetic number, because the mean of its divisors is an integer number (141510).

2⁸²⁰⁶⁷¹ is an apocalyptic number.

820671 is a deficient number, since it is larger than the sum of its proper divisors (311409).

820671 is a wasteful number, since it uses less digits than its factorization.

820671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9465.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 820671 is about 905.9089358208. The cubic root of 820671 is about 93.6245397341.

Adding to 820671 its reverse (176028), we get a palindrome (996699).

The spelling of 820671 in words is "eight hundred twenty thousand, six hundred seventy-one".