20939423993 has 8 divisors (see below), whose sum is σ = 22083815520. Its totient is φ = 19799264160.

The previous prime is 20939423971. The next prime is 20939424017. The reversal of 20939423993 is 39932493902.

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 20939423993 - 2⁸ = 20939423737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20939423933) 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, 1047755 + ... + 1067552.

It is an arithmetic number, because the mean of its divisors is an integer number (2760476940).

Almost surely, 2^20939423993 is an apocalyptic number.

It is an amenable number.

20939423993 is a deficient number, since it is larger than the sum of its proper divisors (1144391527).

20939423993 is a wasteful number, since it uses less digits than its factorization.

20939423993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115847.

The product of its (nonzero) digits is 2834352, while the sum is 53.

The spelling of 20939423993 in words is "twenty billion, nine hundred thirty-nine million, four hundred twenty-three thousand, nine hundred ninety-three".