20039317921 has 8 divisors (see below), whose sum is σ = 22918343040. Its totient is φ = 17164359168.

The previous prime is 20039317913. The next prime is 20039317933. The reversal of 20039317921 is 12971393002.

It is a happy number.

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 20039317921 - 2³ = 20039317913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20039317951) 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, 1006021 + ... + 1025746.

It is an arithmetic number, because the mean of its divisors is an integer number (2864792880).

Almost surely, 2^20039317921 is an apocalyptic number.

It is an amenable number.

20039317921 is a deficient number, since it is larger than the sum of its proper divisors (2879025119).

20039317921 is a wasteful number, since it uses less digits than its factorization.

20039317921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2033183.

The product of its (nonzero) digits is 20412, while the sum is 37.

The spelling of 20039317921 in words is "twenty billion, thirty-nine million, three hundred seventeen thousand, nine hundred twenty-one".