820776923620 has 24 divisors (see below), whose sum is σ = 1723653860544. Its totient is φ = 328306517856.

The previous prime is 820776923609. The next prime is 820776923693. The reversal of 820776923620 is 26329677028.

It is a super-2 number, since 2×820776923620² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1656417 + ... + 2094103.

It is an arithmetic number, because the mean of its divisors is an integer number (71818910856).

Almost surely, 2^820776923620 is an apocalyptic number.

It is an amenable number.

820776923620 is an abundant number, since it is smaller than the sum of its proper divisors (902876936924).

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

820776923620 is a wasteful number, since it uses less digits than its factorization.

820776923620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531459 (or 531457 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 52.

The spelling of 820776923620 in words is "eight hundred twenty billion, seven hundred seventy-six million, nine hundred twenty-three thousand, six hundred twenty".