820671413 has 4 divisors (see below), whose sum is σ = 868946220. Its totient is φ = 772396608.

The previous prime is 820671407. The next prime is 820671421. The reversal of 820671413 is 314176028.

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 456548689 + 364122724 = 21367^2 + 19082^2 .

It is a cyclic number.

It is not a de Polignac number, because 820671413 - 2¹⁴ = 820655029 is a prime.

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 820671413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820671013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24137378 + ... + 24137411.

It is an arithmetic number, because the mean of its divisors is an integer number (217236555).

Almost surely, 2^820671413 is an apocalyptic number.

It is an amenable number.

820671413 is a deficient number, since it is larger than the sum of its proper divisors (48274807).

820671413 is a wasteful number, since it uses less digits than its factorization.

820671413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48274806.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 820671413 is about 28647.3631072739. The cubic root of 820671413 is about 936.2455543956.

The spelling of 820671413 in words is "eight hundred twenty million, six hundred seventy-one thousand, four hundred thirteen".