20288664438436 has 27 divisors (see below), whose sum is σ = 35561802067617. Its totient is φ = 10128175316640.

The previous prime is 20288664438433. The next prime is 20288664438517. The reversal of 20288664438436 is 63483446688202.

The square root of 20288664438436 is 4504294.

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., 3154495688100 + 17134168750336 = 1776090^2 + 4139344^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20288664438433) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7305963480 + ... + 7305966256.

Almost surely, 2^{20288664438436} is an apocalyptic number.

20288664438436 is the 4504294-th square number.

It is an amenable number.

20288664438436 is a deficient number, since it is larger than the sum of its proper divisors (15273137629181).

20288664438436 is an frugal number, since it uses more digits than its factorization.

20288664438436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7180 (or 3590 counting only the distinct ones).

The product of its (nonzero) digits is 254803968, while the sum is 64.

The spelling of 20288664438436 in words is "twenty trillion, two hundred eighty-eight billion, six hundred sixty-four million, four hundred thirty-eight thousand, four hundred thirty-six".