20839389860 has 24 divisors (see below), whose sum is σ = 43917369216. Its totient is φ = 8306298720.

The previous prime is 20839389761. The next prime is 20839389863. The reversal of 20839389860 is 6898393802.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20839389796 and 20839389805.

It is not an unprimeable number, because it can be changed into a prime (20839389863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1835276 + ... + 1846595.

It is an arithmetic number, because the mean of its divisors is an integer number (1829890384).

Almost surely, 2^20839389860 is an apocalyptic number.

20839389860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20839389860 is an abundant number, since it is smaller than the sum of its proper divisors (23077979356).

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

20839389860 is a wasteful number, since it uses less digits than its factorization.

20839389860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3682163 (or 3682161 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 56.

The spelling of 20839389860 in words is "twenty billion, eight hundred thirty-nine million, three hundred eighty-nine thousand, eight hundred sixty".