20381568377 has 8 divisors (see below), whose sum is σ = 20819365632. Its totient is φ = 19943944000.

The previous prime is 20381568367. The next prime is 20381568433. The reversal of 20381568377 is 77386518302.

It is a happy number.

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 20381568377 - 2⁸ = 20381568121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20381568307) 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, 210977 + ... + 292017.

It is an arithmetic number, because the mean of its divisors is an integer number (2602420704).

Almost surely, 2^20381568377 is an apocalyptic number.

It is an amenable number.

20381568377 is a deficient number, since it is larger than the sum of its proper divisors (437797255).

20381568377 is an equidigital number, since it uses as much as digits as its factorization.

20381568377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86439.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 20381568377 in words is "twenty billion, three hundred eighty-one million, five hundred sixty-eight thousand, three hundred seventy-seven".