20689798348816 has 45 divisors (see below), whose sum is σ = 40349009277981. Its totient is φ = 10277588932416.

The previous prime is 20689798348799. The next prime is 20689798348823. The reversal of 20689798348816 is 61884389798602.

The square root of 20689798348816 is 4548604.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6064497264400 + 14625301084416 = 2462620^2 + 3824304^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2856519691 + ... + 2856526933.

Almost surely, 2^{20689798348816} is an apocalyptic number.

20689798348816 is the 4548604-th square number.

It is an amenable number.

20689798348816 is a deficient number, since it is larger than the sum of its proper divisors (19659210929165).

20689798348816 is an frugal number, since it uses more digits than its factorization.

20689798348816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14808 (or 7402 counting only the distinct ones).

The product of its (nonzero) digits is 2006581248, while the sum is 79.

The spelling of 20689798348816 in words is "twenty trillion, six hundred eighty-nine billion, seven hundred ninety-eight million, three hundred forty-eight thousand, eight hundred sixteen".