20111311203 has 4 divisors (see below), whose sum is σ = 26815081608. Its totient is φ = 13407540800.

The previous prime is 20111311201. The next prime is 20111311217. The reversal of 20111311203 is 30211311102.

It is a happy number.

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 20111311203 - 2¹ = 20111311201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20111311201) 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, 3351885198 + ... + 3351885203.

It is an arithmetic number, because the mean of its divisors is an integer number (6703770402).

Almost surely, 2^20111311203 is an apocalyptic number.

20111311203 is a deficient number, since it is larger than the sum of its proper divisors (6703770405).

20111311203 is an equidigital number, since it uses as much as digits as its factorization.

20111311203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6703770404.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 20111311203 its reverse (30211311102), we get a palindrome (50322622305).

The spelling of 20111311203 in words is "twenty billion, one hundred eleven million, three hundred eleven thousand, two hundred three".