20973350539 has 4 divisors (see below), whose sum is σ = 20980165360. Its totient is φ = 20966535720.

The previous prime is 20973350521. The next prime is 20973350543. The reversal of 20973350539 is 93505337902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20973350539 - 2¹⁷ = 20973219467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20973350569) 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 3 ways as a sum of consecutive naturals, for example, 3402792 + ... + 3408949.

It is an arithmetic number, because the mean of its divisors is an integer number (5245041340).

Almost surely, 2^20973350539 is an apocalyptic number.

20973350539 is a deficient number, since it is larger than the sum of its proper divisors (6814821).

20973350539 is an equidigital number, since it uses as much as digits as its factorization.

20973350539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6814820.

The product of its (nonzero) digits is 765450, while the sum is 46.

The spelling of 20973350539 in words is "twenty billion, nine hundred seventy-three million, three hundred fifty thousand, five hundred thirty-nine".