20001320203 has 4 divisors (see below), whose sum is σ = 20031671880. Its totient is φ = 19970968528.

The previous prime is 20001320149. The next prime is 20001320243. The reversal of 20001320203 is 30202310002.

It is a happy number.

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-20001320203 is a prime.

It is a super-2 number, since 2×20001320203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001320243) 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, 15174850 + ... + 15176167.

It is an arithmetic number, because the mean of its divisors is an integer number (5007917970).

Almost surely, 2^20001320203 is an apocalyptic number.

20001320203 is a deficient number, since it is larger than the sum of its proper divisors (30351677).

20001320203 is an equidigital number, since it uses as much as digits as its factorization.

20001320203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30351676.

The product of its (nonzero) digits is 72, while the sum is 13.

Adding to 20001320203 its reverse (30202310002), we get a palindrome (50203630205).

The spelling of 20001320203 in words is "twenty billion, one million, three hundred twenty thousand, two hundred three".