20983847178 has 64 divisors (see below), whose sum is σ = 49145260032. Its totient is φ = 5847992640.

The previous prime is 20983847149. The next prime is 20983847179. The reversal of 20983847178 is 87174838902.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20983847179) 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, 1388523 + ... + 1403553.

It is an arithmetic number, because the mean of its divisors is an integer number (767894688).

Almost surely, 2^20983847178 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20983847178, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24572630016).

20983847178 is an abundant number, since it is smaller than the sum of its proper divisors (28161412854).

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

20983847178 is a wasteful number, since it uses less digits than its factorization.

20983847178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15859.

The product of its (nonzero) digits is 5419008, while the sum is 57.

The spelling of 20983847178 in words is "twenty billion, nine hundred eighty-three million, eight hundred forty-seven thousand, one hundred seventy-eight".