20303212313 has 4 divisors (see below), whose sum is σ = 20332176228. Its totient is φ = 20274248400.

The previous prime is 20303212289. The next prime is 20303212339. The reversal of 20303212313 is 31321230302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16417809424 + 3885402889 = 128132^2 + 62333^2 .

It is a cyclic number.

It is not a de Polignac number, because 20303212313 - 2²² = 20299018009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20303212373) 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, 14480906 + ... + 14482307.

It is an arithmetic number, because the mean of its divisors is an integer number (5083044057).

Almost surely, 2^20303212313 is an apocalyptic number.

It is an amenable number.

20303212313 is a deficient number, since it is larger than the sum of its proper divisors (28963915).

20303212313 is an equidigital number, since it uses as much as digits as its factorization.

20303212313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28963914.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 20303212313 its reverse (31321230302), we get a palindrome (51624442615).

The spelling of 20303212313 in words is "twenty billion, three hundred three million, two hundred twelve thousand, three hundred thirteen".