20001011002003 has 4 divisors (see below), whose sum is σ = 20541578866960. Its totient is φ = 19460443137048.

The previous prime is 20001011001989. The next prime is 20001011002009. The reversal of 20001011002003 is 30020011010002.

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 20001011002003 - 2¹⁷ = 20001010870931 is a prime.

It is a super-2 number, since 2×20001011002003² (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 (20001011002009) 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, 270283932423 + ... + 270283932496.

It is an arithmetic number, because the mean of its divisors is an integer number (5135394716740).

Almost surely, 2^{20001011002003} is an apocalyptic number.

20001011002003 is a deficient number, since it is larger than the sum of its proper divisors (540567864957).

20001011002003 is an equidigital number, since it uses as much as digits as its factorization.

20001011002003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540567864956.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 20001011002003 its reverse (30020011010002), we get a palindrome (50021022012005).

The spelling of 20001011002003 in words is "twenty trillion, one billion, eleven million, two thousand, three".