20840779008 has 360 divisors, whose sum is σ = 73484906880. Its totient is φ = 5748019200.

The previous prime is 20840778953. The next prime is 20840779027. The reversal of 20840779008 is 80097704802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4206933 + ... + 4211883.

Almost surely, 2^20840779008 is an apocalyptic number.

20840779008 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20840779008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36742453440).

20840779008 is an abundant number, since it is smaller than the sum of its proper divisors (52644127872).

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

20840779008 is an equidigital number, since it uses as much as digits as its factorization.

20840779008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5015 (or 4992 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The spelling of 20840779008 in words is "twenty billion, eight hundred forty million, seven hundred seventy-nine thousand, eight".