20131970865 has 16 divisors (see below), whose sum is σ = 33250223616. Its totient is φ = 10390694400.

The previous prime is 20131970861. The next prime is 20131970891. The reversal of 20131970865 is 56807913102.

It is not a de Polignac number, because 20131970865 - 2² = 20131970861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20131970861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21646816 + ... + 21647745.

It is an arithmetic number, because the mean of its divisors is an integer number (2078138976).

Almost surely, 2^20131970865 is an apocalyptic number.

It is an amenable number.

20131970865 is a deficient number, since it is larger than the sum of its proper divisors (13118252751).

20131970865 is a wasteful number, since it uses less digits than its factorization.

20131970865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43294600.

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 20131970865 in words is "twenty billion, one hundred thirty-one million, nine hundred seventy thousand, eight hundred sixty-five".