20311801918219 has 4 divisors (see below), whose sum is σ = 23213487906544. Its totient is φ = 17410115929896.

The previous prime is 20311801918193. The next prime is 20311801918249. The reversal of 20311801918219 is 91281910811302.

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 20311801918219 - 2⁷ = 20311801918091 is a prime.

It is a super-2 number, since 2×20311801918219² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20311801918249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1450842994152 + ... + 1450842994165.

It is an arithmetic number, because the mean of its divisors is an integer number (5803371976636).

Almost surely, 2^{20311801918219} is an apocalyptic number.

20311801918219 is a deficient number, since it is larger than the sum of its proper divisors (2901685988325).

20311801918219 is an equidigital number, since it uses as much as digits as its factorization.

20311801918219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2901685988324.

The product of its (nonzero) digits is 62208, while the sum is 46.

The spelling of 20311801918219 in words is "twenty trillion, three hundred eleven billion, eight hundred one million, nine hundred eighteen thousand, two hundred nineteen".