820401079922 has 18 divisors (see below), whose sum is σ = 1257433993647. Its totient is φ = 401443407324.

The previous prime is 820401079913. The next prime is 820401079951. The reversal of 820401079922 is 229970104028.

It can be written as a sum of positive squares in only one way, i.e., 410200539961 + 410200539961 = 640469^2 + 640469^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=640469.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 60197273 + ... + 60210899.

Almost surely, 2^820401079922 is an apocalyptic number.

820401079922 is a deficient number, since it is larger than the sum of its proper divisors (437032913725).

820401079922 is an frugal number, since it uses more digits than its factorization.

820401079922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27350 (or 13676 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 820401079922 in words is "eight hundred twenty billion, four hundred one million, seventy-nine thousand, nine hundred twenty-two".