20507317451 has 12 divisors (see below), whose sum is σ = 21100272480. Its totient is φ = 19930609440.

The previous prime is 20507317429. The next prime is 20507317469. The reversal of 20507317451 is 15471370502.

It is a de Polignac number, because none of the positive numbers 2^k-20507317451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20507317421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1280270 + ... + 1296188.

It is an arithmetic number, because the mean of its divisors is an integer number (1758356040).

Almost surely, 2^20507317451 is an apocalyptic number.

20507317451 is a deficient number, since it is larger than the sum of its proper divisors (592955029).

20507317451 is an equidigital number, since it uses as much as digits as its factorization.

20507317451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16934 (or 16897 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 35.

Adding to 20507317451 its reverse (15471370502), we get a palindrome (35978687953).

The spelling of 20507317451 in words is "twenty billion, five hundred seven million, three hundred seventeen thousand, four hundred fifty-one".