820470510512806 has 16 divisors (see below), whose sum is σ = 1260723990108240. Its totient is φ = 400229196517120.

The previous prime is 820470510512789. The next prime is 820470510512819. The reversal of 820470510512806 is 608215015074028.

It is a super-2 number, since 2×820470510512806² (a number of 31 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 820470510512806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123479565 + ... + 129954391.

It is an arithmetic number, because the mean of its divisors is an integer number (78795249381765).

Almost surely, 2^{820470510512806} is an apocalyptic number.

820470510512806 is a deficient number, since it is larger than the sum of its proper divisors (440253479595434).

820470510512806 is a wasteful number, since it uses less digits than its factorization.

820470510512806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8020199.

The product of its (nonzero) digits is 1075200, while the sum is 49.

The spelling of 820470510512806 in words is "eight hundred twenty trillion, four hundred seventy billion, five hundred ten million, five hundred twelve thousand, eight hundred six".