820990795623 has 32 divisors (see below), whose sum is σ = 1107746295552. Its totient is φ = 540813504000.

The previous prime is 820990795613. The next prime is 820990795657. The reversal of 820990795623 is 326597099028.

It is not a de Polignac number, because 820990795623 - 2⁴ = 820990795607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820990795613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 248708073 + ... + 248711373.

It is an arithmetic number, because the mean of its divisors is an integer number (34617071736).

Almost surely, 2^820990795623 is an apocalyptic number.

820990795623 is a deficient number, since it is larger than the sum of its proper divisors (286755499929).

820990795623 is a wasteful number, since it uses less digits than its factorization.

820990795623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5455.

The product of its (nonzero) digits is 14696640, while the sum is 60.

The spelling of 820990795623 in words is "eight hundred twenty billion, nine hundred ninety million, seven hundred ninety-five thousand, six hundred twenty-three".