820530109 has 16 divisors (see below), whose sum is σ = 1000747008. Its totient is φ = 656716032.

The previous prime is 820530017. The next prime is 820530121. The reversal of 820530109 is 901035028.

It is not a de Polignac number, because 820530109 - 2⁷ = 820529981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820530149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12034 + ... + 42259.

It is an arithmetic number, because the mean of its divisors is an integer number (62546688).

Almost surely, 2^820530109 is an apocalyptic number.

It is an amenable number.

820530109 is a deficient number, since it is larger than the sum of its proper divisors (180216899).

820530109 is a wasteful number, since it uses less digits than its factorization.

820530109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54444.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 820530109 is about 28644.8967357189. The cubic root of 820530109 is about 936.1918167554.

The spelling of 820530109 in words is "eight hundred twenty million, five hundred thirty thousand, one hundred nine".