20839991943 has 8 divisors (see below), whose sum is σ = 29421165168. Its totient is φ = 13076073344.

The previous prime is 20839991933. The next prime is 20839991951. The reversal of 20839991943 is 34919993802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20839991943 - 2⁴ = 20839991927 is a prime.

It is a super-3 number, since 3×20839991943³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20839991933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204313596 + ... + 204313697.

It is an arithmetic number, because the mean of its divisors is an integer number (3677645646).

Almost surely, 2^20839991943 is an apocalyptic number.

20839991943 is a deficient number, since it is larger than the sum of its proper divisors (8581173225).

20839991943 is a wasteful number, since it uses less digits than its factorization.

20839991943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408627313.

The product of its (nonzero) digits is 3779136, while the sum is 57.

The spelling of 20839991943 in words is "twenty billion, eight hundred thirty-nine million, nine hundred ninety-one thousand, nine hundred forty-three".