20330439921 has 24 divisors (see below), whose sum is σ = 32474703456. Its totient is φ = 12152687040.

The previous prime is 20330439919. The next prime is 20330439953. The reversal of 20330439921 is 12993403302.

It is not a de Polignac number, because 20330439921 - 2¹ = 20330439919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20330439121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1399335 + ... + 1413788.

It is an arithmetic number, because the mean of its divisors is an integer number (1353112644).

Almost surely, 2^20330439921 is an apocalyptic number.

It is an amenable number.

20330439921 is a deficient number, since it is larger than the sum of its proper divisors (12144263535).

20330439921 is a wasteful number, since it uses less digits than its factorization.

20330439921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813213 (or 2813210 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The spelling of 20330439921 in words is "twenty billion, three hundred thirty million, four hundred thirty-nine thousand, nine hundred twenty-one".