20502168537017 has 4 divisors (see below), whose sum is σ = 20502314572416. Its totient is φ = 20502022501620.

The previous prime is 20502168536981. The next prime is 20502168537029. The reversal of 20502168537017 is 71073586120502.

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 20502168537017 - 2¹⁴ = 20502168520633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20502168537217) 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, 72806909 + ... + 73087962.

It is an arithmetic number, because the mean of its divisors is an integer number (5125578643104).

Almost surely, 2^{20502168537017} is an apocalyptic number.

It is an amenable number.

20502168537017 is a deficient number, since it is larger than the sum of its proper divisors (146035399).

20502168537017 is a wasteful number, since it uses less digits than its factorization.

20502168537017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146035398.

The product of its (nonzero) digits is 705600, while the sum is 47.

The spelling of 20502168537017 in words is "twenty trillion, five hundred two billion, one hundred sixty-eight million, five hundred thirty-seven thousand, seventeen".