820706 has 4 divisors (see below), whose sum is σ = 1231062. Its totient is φ = 410352.

The previous prime is 820691. The next prime is 820711. The reversal of 820706 is 607028.

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

It can be written as a sum of positive squares in only one way, i.e., 819025 + 1681 = 905^2 + 41^2 .

It is an unprimeable number.

820706 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205175 + ... + 205178.

2⁸²⁰⁷⁰⁶ is an apocalyptic number.

820706 is a deficient number, since it is larger than the sum of its proper divisors (410356).

820706 is a wasteful number, since it uses less digits than its factorization.

820706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410355.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 820706 is about 905.9282532298. The cubic root of 820706 is about 93.6258706826.

The spelling of 820706 in words is "eight hundred twenty thousand, seven hundred six".