20389453718 has 8 divisors (see below), whose sum is σ = 30660451560. Its totient is φ = 10169303200.

The previous prime is 20389453691. The next prime is 20389453723. The reversal of 20389453718 is 81735498302.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12710828 + ... + 12712431.

It is an arithmetic number, because the mean of its divisors is an integer number (3832556445).

Almost surely, 2^20389453718 is an apocalyptic number.

20389453718 is a deficient number, since it is larger than the sum of its proper divisors (10270997842).

20389453718 is a wasteful number, since it uses less digits than its factorization.

20389453718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25423662.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 20389453718 in words is "twenty billion, three hundred eighty-nine million, four hundred fifty-three thousand, seven hundred eighteen".