20384268991 has 8 divisors (see below), whose sum is σ = 20625637424. Its totient is φ = 20143537920.

The previous prime is 20384268973. The next prime is 20384269001. The reversal of 20384268991 is 19986248302.

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 20384268991 - 2³³ = 11794334399 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 (20384268941) 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, 94845 + ... + 223078.

It is an arithmetic number, because the mean of its divisors is an integer number (2578204678).

Almost surely, 2^20384268991 is an apocalyptic number.

20384268991 is a deficient number, since it is larger than the sum of its proper divisors (241368433).

20384268991 is an equidigital number, since it uses as much as digits as its factorization.

20384268991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318681.

The product of its (nonzero) digits is 1492992, while the sum is 52.

The spelling of 20384268991 in words is "twenty billion, three hundred eighty-four million, two hundred sixty-eight thousand, nine hundred ninety-one".