820391039112220 has 24 divisors (see below), whose sum is σ = 1723838796608544. Its totient is φ = 327962584316736.

The previous prime is 820391039112131. The next prime is 820391039112277. The reversal of 820391039112220 is 22211930193028.

It is a happy number.

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, 12114423304 + ... + 12114491023.

It is an arithmetic number, because the mean of its divisors is an integer number (71826616525356).

Almost surely, 2^{820391039112220} is an apocalyptic number.

It is an amenable number.

820391039112220 is an abundant number, since it is smaller than the sum of its proper divisors (903447757496324).

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

820391039112220 is a wasteful number, since it uses less digits than its factorization.

820391039112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24228916029 (or 24228916027 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 820391039112220 in words is "eight hundred twenty trillion, three hundred ninety-one billion, thirty-nine million, one hundred twelve thousand, two hundred twenty".