20381657788799 has 8 divisors (see below), whose sum is σ = 20388729261600. Its totient is φ = 20374586668800.

The previous prime is 20381657788717. The next prime is 20381657788837. The reversal of 20381657788799 is 99788775618302.

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

It is a cyclic number.

It is not a de Polignac number, because 20381657788799 - 2²⁴ = 20381641011583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20381657788199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172841339 + ... + 172959219.

It is an arithmetic number, because the mean of its divisors is an integer number (2548591157700).

Almost surely, 2^{20381657788799} is an apocalyptic number.

20381657788799 is a deficient number, since it is larger than the sum of its proper divisors (7071472801).

20381657788799 is a wasteful number, since it uses less digits than its factorization.

20381657788799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176401.

The product of its (nonzero) digits is 2560481280, while the sum is 80.

The spelling of 20381657788799 in words is "twenty trillion, three hundred eighty-one billion, six hundred fifty-seven million, seven hundred eighty-eight thousand, seven hundred ninety-nine".