20394347291 has 4 divisors (see below), whose sum is σ = 20604598392. Its totient is φ = 20184096192.

The previous prime is 20394347269. The next prime is 20394347317. The reversal of 20394347291 is 19274349302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20394347291 - 2¹⁴ = 20394330907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20394347191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105125405 + ... + 105125598.

It is an arithmetic number, because the mean of its divisors is an integer number (5151149598).

Almost surely, 2^20394347291 is an apocalyptic number.

20394347291 is a deficient number, since it is larger than the sum of its proper divisors (210251101).

20394347291 is an equidigital number, since it uses as much as digits as its factorization.

20394347291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210251100.

The product of its (nonzero) digits is 326592, while the sum is 44.

The spelling of 20394347291 in words is "twenty billion, three hundred ninety-four million, three hundred forty-seven thousand, two hundred ninety-one".