19720731139 has 8 divisors (see below), whose sum is σ = 20581811712. Its totient is φ = 18859955400.

The previous prime is 19720731137. The next prime is 19720731169. The reversal of 19720731139 is 93113702791.

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 19720731139 - 2¹ = 19720731137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19720731095 and 19720731104.

It is not an unprimeable number, because it can be changed into a prime (19720731133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61302 + ... + 207844.

It is an arithmetic number, because the mean of its divisors is an integer number (2572726464).

Almost surely, 2^19720731139 is an apocalyptic number.

19720731139 is a deficient number, since it is larger than the sum of its proper divisors (861080573).

19720731139 is a wasteful number, since it uses less digits than its factorization.

19720731139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152417.

The product of its (nonzero) digits is 71442, while the sum is 43.

The spelling of 19720731139 in words is "nineteen billion, seven hundred twenty million, seven hundred thirty-one thousand, one hundred thirty-nine".