20398454788693 has 8 divisors (see below), whose sum is σ = 21056866375680. Its totient is φ = 19740068009040.

The previous prime is 20398454788681. The next prime is 20398454788709. The reversal of 20398454788693 is 39688745489302.

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

It is a cyclic number.

It is not a de Polignac number, because 20398454788693 - 2¹⁷ = 20398454657621 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 (20398454788633) 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, 4523530 + ... + 7826827.

It is an arithmetic number, because the mean of its divisors is an integer number (2632108296960).

Almost surely, 2^{20398454788693} is an apocalyptic number.

It is an amenable number.

20398454788693 is a deficient number, since it is larger than the sum of its proper divisors (658411586987).

20398454788693 is a wasteful number, since it uses less digits than its factorization.

20398454788693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12403667.

The product of its (nonzero) digits is 2508226560, while the sum is 76.

The spelling of 20398454788693 in words is "twenty trillion, three hundred ninety-eight billion, four hundred fifty-four million, seven hundred eighty-eight thousand, six hundred ninety-three".