20001321313 has 16 divisors (see below), whose sum is σ = 20577908736. Its totient is φ = 19432707840.

The previous prime is 20001321311. The next prime is 20001321323. The reversal of 20001321313 is 31312310002.

It is a cyclic number.

It is not a de Polignac number, because 20001321313 - 2¹ = 20001321311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001321311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3988978 + ... + 3993988.

It is an arithmetic number, because the mean of its divisors is an integer number (1286119296).

Almost surely, 2^20001321313 is an apocalyptic number.

It is an amenable number.

20001321313 is a deficient number, since it is larger than the sum of its proper divisors (576587423).

20001321313 is a wasteful number, since it uses less digits than its factorization.

20001321313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5784.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 20001321313 its reverse (31312310002), we get a palindrome (51313631315).

The spelling of 20001321313 in words is "twenty billion, one million, three hundred twenty-one thousand, three hundred thirteen".