920839391808 has 224 divisors, whose sum is σ = 2908904300544. Its totient is φ = 251363616768.

The previous prime is 920839391789. The next prime is 920839391809. The reversal of 920839391808 is 808193938029.

It is a tau number, because it is divible by the number of its divisors (224).

It is not an unprimeable number, because it can be changed into a prime (920839391809) 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, 27092841 + ... + 27126807.

Almost surely, 2^920839391808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 920839391808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1454452150272).

920839391808 is an abundant number, since it is smaller than the sum of its proper divisors (1988064908736).

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

920839391808 is a wasteful number, since it uses less digits than its factorization.

920839391808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34889 (or 34879 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 60.

The spelling of 920839391808 in words is "nine hundred twenty billion, eight hundred thirty-nine million, three hundred ninety-one thousand, eight hundred eight".