20855439593 has 4 divisors (see below), whose sum is σ = 21208921680. Its totient is φ = 20501957508.

The previous prime is 20855439587. The next prime is 20855439607. The reversal of 20855439593 is 39593455802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20855439593 - 2¹⁴ = 20855423209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20855439533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176740955 + ... + 176741072.

It is an arithmetic number, because the mean of its divisors is an integer number (5302230420).

Almost surely, 2^20855439593 is an apocalyptic number.

It is an amenable number.

20855439593 is a deficient number, since it is larger than the sum of its proper divisors (353482087).

20855439593 is an equidigital number, since it uses as much as digits as its factorization.

20855439593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353482086.

The product of its (nonzero) digits is 5832000, while the sum is 53.

The spelling of 20855439593 in words is "twenty billion, eight hundred fifty-five million, four hundred thirty-nine thousand, five hundred ninety-three".