20203122311 has 4 divisors (see below), whose sum is σ = 20584313352. Its totient is φ = 19821931272.

The previous prime is 20203122301. The next prime is 20203122319. The reversal of 20203122311 is 11322130202.

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-20203122311 is a prime.

It is a super-2 number, since 2×20203122311² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20203122311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203122319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190595441 + ... + 190595546.

It is an arithmetic number, because the mean of its divisors is an integer number (5146078338).

Almost surely, 2^20203122311 is an apocalyptic number.

20203122311 is a deficient number, since it is larger than the sum of its proper divisors (381191041).

20203122311 is an equidigital number, since it uses as much as digits as its factorization.

20203122311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381191040.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20203122311 its reverse (11322130202), we get a palindrome (31525252513).

The spelling of 20203122311 in words is "twenty billion, two hundred three million, one hundred twenty-two thousand, three hundred eleven".