20397459939 has 8 divisors (see below), whose sum is σ = 27369840720. Its totient is φ = 13511692896.

The previous prime is 20397459889. The next prime is 20397459991. The reversal of 20397459939 is 93995479302.

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

It is not a de Polignac number, because 20397459939 - 2¹⁷ = 20397328867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20397459239) 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, 21652884 + ... + 21653825.

It is an arithmetic number, because the mean of its divisors is an integer number (3421230090).

Almost surely, 2^20397459939 is an apocalyptic number.

20397459939 is a deficient number, since it is larger than the sum of its proper divisors (6972380781).

20397459939 is a wasteful number, since it uses less digits than its factorization.

20397459939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43306869.

The product of its (nonzero) digits is 16533720, while the sum is 60.

The spelling of 20397459939 in words is "twenty billion, three hundred ninety-seven million, four hundred fifty-nine thousand, nine hundred thirty-nine".