20001311003 has 4 divisors (see below), whose sum is σ = 20010318768. Its totient is φ = 19992303240.

The previous prime is 20001310999. The next prime is 20001311009. The reversal of 20001311003 is 30011310002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30011310002 = 2 ⋅15005655001.

It is a cyclic number.

It is not a de Polignac number, because 20001311003 - 2² = 20001310999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001311009) 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, 4500551 + ... + 4504992.

It is an arithmetic number, because the mean of its divisors is an integer number (5002579692).

Almost surely, 2^20001311003 is an apocalyptic number.

20001311003 is a deficient number, since it is larger than the sum of its proper divisors (9007765).

20001311003 is an equidigital number, since it uses as much as digits as its factorization.

20001311003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9007764.

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 20001311003 its reverse (30011310002), we get a palindrome (50012621005).

The spelling of 20001311003 in words is "twenty billion, one million, three hundred eleven thousand, three".