820508198460 has 24 divisors (see below), whose sum is σ = 2297422955856. Its totient is φ = 218802186240.

The previous prime is 820508198443. The next prime is 820508198491. The reversal of 820508198460 is 64891805028.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6837568261 + ... + 6837568380.

It is an arithmetic number, because the mean of its divisors is an integer number (95725956494).

Almost surely, 2^820508198460 is an apocalyptic number.

It is an amenable number.

820508198460 is an abundant number, since it is smaller than the sum of its proper divisors (1476914757396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820508198460 is a wasteful number, since it uses less digits than its factorization.

820508198460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13675136653 (or 13675136651 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 51.

The spelling of 820508198460 in words is "eight hundred twenty billion, five hundred eight million, one hundred ninety-eight thousand, four hundred sixty".