20639398695 has 8 divisors (see below), whose sum is σ = 33023037936. Its totient is φ = 11007679296.

The previous prime is 20639398693. The next prime is 20639398699. The reversal of 20639398695 is 59689393602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20639398695 - 2¹ = 20639398693 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20639398693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 687979942 + ... + 687979971.

It is an arithmetic number, because the mean of its divisors is an integer number (4127879742).

Almost surely, 2^20639398695 is an apocalyptic number.

20639398695 is a deficient number, since it is larger than the sum of its proper divisors (12383639241).

20639398695 is a wasteful number, since it uses less digits than its factorization.

20639398695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375959921.

The product of its (nonzero) digits is 18895680, while the sum is 60.

The spelling of 20639398695 in words is "twenty billion, six hundred thirty-nine million, three hundred ninety-eight thousand, six hundred ninety-five".