6820505 has 4 divisors (see below), whose sum is σ = 8184612. Its totient is φ = 5456400.

The previous prime is 6820493. The next prime is 6820511. The reversal of 6820505 is 5050286.

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

It can be written as a sum of positive squares in 2 ways, for example, as 808201 + 6012304 = 899^2 + 2452^2 .

It is not a de Polignac number, because 6820505 - 2⁶ = 6820441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 682046 + ... + 682055.

It is an arithmetic number, because the mean of its divisors is an integer number (2046153).

Almost surely, 2^6820505 is an apocalyptic number.

It is an amenable number.

6820505 is a deficient number, since it is larger than the sum of its proper divisors (1364107).

6820505 is a wasteful number, since it uses less digits than its factorization.

6820505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364106.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 6820505 is about 2611.6096568974. The cubic root of 6820505 is about 189.6438851248.

The spelling of 6820505 in words is "six million, eight hundred twenty thousand, five hundred five".