20813997319696 has 45 divisors (see below), whose sum is σ = 46911427278669. Its totient is φ = 8920229818752.

The previous prime is 20813997319673. The next prime is 20813997319747. The reversal of 20813997319696 is 69691379931802.

The square root of 20813997319696 is 4562236.

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., 3800550250000 + 17013447069696 = 1949500^2 + 4124736^2 .

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, 127661140 + ... + 127824076.

Almost surely, 2^{20813997319696} is an apocalyptic number.

20813997319696 is the 4562236-th square number.

It is an amenable number.

20813997319696 is an abundant number, since it is smaller than the sum of its proper divisors (26097429958973).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20813997319696 is an frugal number, since it uses more digits than its factorization.

20813997319696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325896 (or 162946 counting only the distinct ones).

The product of its (nonzero) digits is 238085568, while the sum is 73.

The spelling of 20813997319696 in words is "twenty trillion, eight hundred thirteen billion, nine hundred ninety-seven million, three hundred nineteen thousand, six hundred ninety-six".