20309965361 has 12 divisors (see below), whose sum is σ = 23694777792. Its totient is φ = 17408527332.

The previous prime is 20309965343. The next prime is 20309965441. The reversal of 20309965361 is 16356990302.

It is a de Polignac number, because none of the positive numbers 2^k-20309965361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20309965061) 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 11 ways as a sum of consecutive naturals, for example, 587405 + ... + 621018.

It is an arithmetic number, because the mean of its divisors is an integer number (1974564816).

Almost surely, 2^20309965361 is an apocalyptic number.

It is an amenable number.

20309965361 is a deficient number, since it is larger than the sum of its proper divisors (3384812431).

20309965361 is an frugal number, since it uses more digits than its factorization.

20309965361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208458 (or 1208430 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 44.

The spelling of 20309965361 in words is "twenty billion, three hundred nine million, nine hundred sixty-five thousand, three hundred sixty-one".