20201321309 has 24 divisors (see below), whose sum is σ = 22835812608. Its totient is φ = 17756625600.

The previous prime is 20201321293. The next prime is 20201321311. The reversal of 20201321309 is 90312310202.

It is not a de Polignac number, because 20201321309 - 2⁴ = 20201321293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201321339) 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 23 ways as a sum of consecutive naturals, for example, 824384 + ... + 848534.

It is an arithmetic number, because the mean of its divisors is an integer number (951492192).

Almost surely, 2^20201321309 is an apocalyptic number.

It is an amenable number.

20201321309 is a deficient number, since it is larger than the sum of its proper divisors (2634491299).

20201321309 is a wasteful number, since it uses less digits than its factorization.

20201321309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24285 (or 24248 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

It can be divided in two parts, 202013 and 21309, that added together give a palindrome (223322).

The spelling of 20201321309 in words is "twenty billion, two hundred one million, three hundred twenty-one thousand, three hundred nine".