820630837 has 4 divisors (see below), whose sum is σ = 883756300. Its totient is φ = 757505376.

The previous prime is 820630831. The next prime is 820630847. The reversal of 820630837 is 738036028.

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

It can be written as a sum of positive squares in 2 ways, for example, as 258277041 + 562353796 = 16071^2 + 23714^2 .

It is a cyclic number.

It is not a de Polignac number, because 820630837 - 2²⁷ = 686413109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 820630796 and 820630805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820630831) 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, 31562712 + ... + 31562737.

It is an arithmetic number, because the mean of its divisors is an integer number (220939075).

Almost surely, 2^820630837 is an apocalyptic number.

It is an amenable number.

820630837 is a deficient number, since it is larger than the sum of its proper divisors (63125463).

820630837 is a wasteful number, since it uses less digits than its factorization.

820630837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63125462.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 820630837 is about 28646.6549007035. The cubic root of 820630837 is about 936.2301240520.

The spelling of 820630837 in words is "eight hundred twenty million, six hundred thirty thousand, eight hundred thirty-seven".