6820045 has 4 divisors (see below), whose sum is σ = 8184060. Its totient is φ = 5456032.

The previous prime is 6820039. The next prime is 6820057. The reversal of 6820045 is 5400286.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5400286 = 2 ⋅2700143.

It can be written as a sum of positive squares in 2 ways, for example, as 4301476 + 2518569 = 2074^2 + 1587^2 .

It is a cyclic number.

It is not a de Polignac number, because 6820045 - 2⁵ = 6820013 is a prime.

It is a nialpdrome in base 14.

It is a congruent 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, 682000 + ... + 682009.

It is an arithmetic number, because the mean of its divisors is an integer number (2046015).

Almost surely, 2^6820045 is an apocalyptic number.

It is an amenable number.

6820045 is a deficient number, since it is larger than the sum of its proper divisors (1364015).

6820045 is a wasteful number, since it uses less digits than its factorization.

6820045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364014.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 6820045 is about 2611.5215871212. The cubic root of 6820045 is about 189.6396216014.

The spelling of 6820045 in words is "six million, eight hundred twenty thousand, forty-five".