820147 has 4 divisors (see below), whose sum is σ = 832456. Its totient is φ = 807840.

The previous prime is 820133. The next prime is 820163. The reversal of 820147 is 741028.

820147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 820147 - 2¹¹ = 818099 is a prime.

It is a super-2 number, since 2×820147² = 1345282203218, which contains 22 as substring.

It is a Duffinian number.

820147 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (820117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6054 + ... + 6187.

It is an arithmetic number, because the mean of its divisors is an integer number (208114).

2⁸²⁰¹⁴⁷ is an apocalyptic number.

820147 is a deficient number, since it is larger than the sum of its proper divisors (12309).

820147 is a wasteful number, since it uses less digits than its factorization.

820147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12308.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 820147 is about 905.6196773481. The cubic root of 820147 is about 93.6046090092.

The spelling of 820147 in words is "eight hundred twenty thousand, one hundred forty-seven".