20517050353 has 4 divisors (see below), whose sum is σ = 20583021888. Its totient is φ = 20451078820.

The previous prime is 20517050329. The next prime is 20517050371. The reversal of 20517050353 is 35305071502.

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 a de Polignac number, because none of the positive numbers 2^k-20517050353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20517050753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32985301 + ... + 32985922.

It is an arithmetic number, because the mean of its divisors is an integer number (5145755472).

Almost surely, 2^20517050353 is an apocalyptic number.

It is an amenable number.

20517050353 is a deficient number, since it is larger than the sum of its proper divisors (65971535).

20517050353 is an equidigital number, since it uses as much as digits as its factorization.

20517050353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65971534.

The product of its (nonzero) digits is 15750, while the sum is 31.

The spelling of 20517050353 in words is "twenty billion, five hundred seventeen million, fifty thousand, three hundred fifty-three".