820230931 has 8 divisors (see below), whose sum is σ = 929816720. Its totient is φ = 717286752.

The previous prime is 820230889. The next prime is 820230989. The reversal of 820230931 is 139032028.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 820230931 - 2²¹ = 818133779 is a prime.

It is a super-2 number, since 2×820230931² = 1345557560338253522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 820230931.

It is not an unprimeable number, because it can be changed into a prime (820240931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1660140 + ... + 1660633.

It is an arithmetic number, because the mean of its divisors is an integer number (116227090).

Almost surely, 2^820230931 is an apocalyptic number.

820230931 is a deficient number, since it is larger than the sum of its proper divisors (109585789).

820230931 is a wasteful number, since it uses less digits than its factorization.

820230931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320805.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 820230931 is about 28639.6740728661. The cubic root of 820230931 is about 936.0780195728.

Adding to 820230931 its reverse (139032028), we get a palindrome (959262959).

The spelling of 820230931 in words is "eight hundred twenty million, two hundred thirty thousand, nine hundred thirty-one".