20785099856 has 40 divisors (see below), whose sum is σ = 42419442720. Its totient is φ = 9838889856.

The previous prime is 20785099843. The next prime is 20785099859. The reversal of 20785099856 is 65899058702.

It is a junction number, because it is equal to n+sod(n) for n = 20785099795 and 20785099804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20785099859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440546 + ... + 485438.

It is an arithmetic number, because the mean of its divisors is an integer number (1060486068).

Almost surely, 2^20785099856 is an apocalyptic number.

It is an amenable number.

20785099856 is an abundant number, since it is smaller than the sum of its proper divisors (21634342864).

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

20785099856 is a wasteful number, since it uses less digits than its factorization.

20785099856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46443 (or 46437 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 59.

The spelling of 20785099856 in words is "twenty billion, seven hundred eighty-five million, ninety-nine thousand, eight hundred fifty-six".