20389018705 has 8 divisors (see below), whose sum is σ = 26691079104. Its totient is φ = 14828377200.

The previous prime is 20389018691. The next prime is 20389018747. The reversal of 20389018705 is 50781098302.

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

It is not a de Polignac number, because 20389018705 - 2⁵ = 20389018673 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185354661 + ... + 185354770.

It is an arithmetic number, because the mean of its divisors is an integer number (3336384888).

Almost surely, 2^20389018705 is an apocalyptic number.

It is an amenable number.

20389018705 is a deficient number, since it is larger than the sum of its proper divisors (6302060399).

20389018705 is a wasteful number, since it uses less digits than its factorization.

20389018705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370709447.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 20389018705 in words is "twenty billion, three hundred eighty-nine million, eighteen thousand, seven hundred five".