20203113111311 has 4 divisors (see below), whose sum is σ = 21757198735272. Its totient is φ = 18649027487352.

The previous prime is 20203113111193. The next prime is 20203113111317. The reversal of 20203113111311 is 11311131130202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20203113111311 is a prime.

It is a super-2 number, since 2×20203113111311² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203113111317) 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, 777042811961 + ... + 777042811986.

It is an arithmetic number, because the mean of its divisors is an integer number (5439299683818).

Almost surely, 2^{20203113111311} is an apocalyptic number.

20203113111311 is a deficient number, since it is larger than the sum of its proper divisors (1554085623961).

20203113111311 is a wasteful number, since it uses less digits than its factorization.

20203113111311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1554085623960.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 20203113111311 its reverse (11311131130202), we get a palindrome (31514244241513).

The spelling of 20203113111311 in words is "twenty trillion, two hundred three billion, one hundred thirteen million, one hundred eleven thousand, three hundred eleven".