20321100313 has 16 divisors (see below), whose sum is σ = 21747897360. Its totient is φ = 18952192000.

The previous prime is 20321100287. The next prime is 20321100329. The reversal of 20321100313 is 31300112302.

It can be written as a sum of positive squares in 8 ways, for example, as 1875929344 + 18445170969 = 43312^2 + 135813^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321100313 - 2⁹ = 20321099801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20321100113) 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, 35481 + ... + 204697.

It is an arithmetic number, because the mean of its divisors is an integer number (1359243585).

Almost surely, 2^20321100313 is an apocalyptic number.

It is an amenable number.

20321100313 is a deficient number, since it is larger than the sum of its proper divisors (1426797047).

20321100313 is a wasteful number, since it uses less digits than its factorization.

20321100313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169388.

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

Adding to 20321100313 its reverse (31300112302), we get a palindrome (51621212615).

The spelling of 20321100313 in words is "twenty billion, three hundred twenty-one million, one hundred thousand, three hundred thirteen".