20381559696 has 45 divisors (see below), whose sum is σ = 57044854321. Its totient is φ = 6793282176.

The previous prime is 20381559689. The next prime is 20381559707. The reversal of 20381559696 is 69695518302.

It is a happy number.

The square root of 20381559696 is 142764.

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

20381559696 is a `hidden beast` number, since 2 + 0 + 3 + 81 + 559 + 6 + 9 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20272064400 + 109495296 = 142380^2 + 10464^2 .

It is a super-2 number, since 2×20381559696² (a number of 21 digits) contains 22 as substring.

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, 1707220 + ... + 1719116.

Almost surely, 2^20381559696 is an apocalyptic number.

20381559696 is the 142764-th square number.

It is an amenable number.

20381559696 is an abundant number, since it is smaller than the sum of its proper divisors (36663294625).

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

20381559696 is an frugal number, since it uses more digits than its factorization.

20381559696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23808 (or 11902 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 54.

The spelling of 20381559696 in words is "twenty billion, three hundred eighty-one million, five hundred fifty-nine thousand, six hundred ninety-six".