20310051517 has 4 divisors (see below), whose sum is σ = 23211487456. Its totient is φ = 17408615580.

The previous prime is 20310051479. The next prime is 20310051523. The reversal of 20310051517 is 71515001302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20310051517 - 2¹⁵ = 20310018749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20310051491 and 20310051500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20310051547) 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 3 ways as a sum of consecutive naturals, for example, 1450717959 + ... + 1450717972.

It is an arithmetic number, because the mean of its divisors is an integer number (5802871864).

Almost surely, 2^20310051517 is an apocalyptic number.

It is an amenable number.

20310051517 is a deficient number, since it is larger than the sum of its proper divisors (2901435939).

20310051517 is an equidigital number, since it uses as much as digits as its factorization.

20310051517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2901435938.

The product of its (nonzero) digits is 1050, while the sum is 25.

Adding to 20310051517 its reverse (71515001302), we get a palindrome (91825052819).

The spelling of 20310051517 in words is "twenty billion, three hundred ten million, fifty-one thousand, five hundred seventeen".