20313320251 has 16 divisors (see below), whose sum is σ = 25059916800. Its totient is φ = 16080105888.

The previous prime is 20313320243. The next prime is 20313320303. The reversal of 20313320251 is 15202331302.

It is not a de Polignac number, because 20313320251 - 2³ = 20313320243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20313320201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2170671 + ... + 2180008.

It is an arithmetic number, because the mean of its divisors is an integer number (1566244800).

Almost surely, 2^20313320251 is an apocalyptic number.

20313320251 is a deficient number, since it is larger than the sum of its proper divisors (4746596549).

20313320251 is a wasteful number, since it uses less digits than its factorization.

20313320251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4350738.

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 20313320251 its reverse (15202331302), we get a palindrome (35515651553).

The spelling of 20313320251 in words is "twenty billion, three hundred thirteen million, three hundred twenty thousand, two hundred fifty-one".