820270 has 16 divisors (see below), whose sum is σ = 1610928. Its totient is φ = 298240.

The previous prime is 820247. The next prime is 820271. The reversal of 820270 is 72028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820271) by changing a digit.

820270 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 in 7 ways as a sum of consecutive naturals, for example, 3619 + ... + 3838.

It is an arithmetic number, because the mean of its divisors is an integer number (100683).

2⁸²⁰²⁷⁰ is an apocalyptic number.

820270 is a deficient number, since it is larger than the sum of its proper divisors (790658).

820270 is a wasteful number, since it uses less digits than its factorization.

820270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7475.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 820270 is about 905.6875841039. The cubic root of 820270 is about 93.6092881668.

Adding to 820270 its reverse (72028), we get a palindrome (892298).

The spelling of 820270 in words is "eight hundred twenty thousand, two hundred seventy".