20595193639 has 4 divisors (see below), whose sum is σ = 21305372760. Its totient is φ = 19885014520.

The previous prime is 20595193631. The next prime is 20595193651. The reversal of 20595193639 is 93639159502.

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 20595193639 - 2³ = 20595193631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20595193631) 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, 355089517 + ... + 355089574.

It is an arithmetic number, because the mean of its divisors is an integer number (5326343190).

Almost surely, 2^20595193639 is an apocalyptic number.

20595193639 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20595193639 is a deficient number, since it is larger than the sum of its proper divisors (710179121).

20595193639 is an equidigital number, since it uses as much as digits as its factorization.

20595193639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710179120.

The product of its (nonzero) digits is 1968300, while the sum is 52.

The spelling of 20595193639 in words is "twenty billion, five hundred ninety-five million, one hundred ninety-three thousand, six hundred thirty-nine".