20501887017017 has 4 divisors (see below), whose sum is σ = 23430728019456. Its totient is φ = 17573046014580.

The previous prime is 20501887016999. The next prime is 20501887017037. The reversal of 20501887017017 is 71071078810502.

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 not a de Polignac number, because 20501887017017 - 2³² = 20497592049721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20501887017037) 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, 1464420501209 + ... + 1464420501222.

It is an arithmetic number, because the mean of its divisors is an integer number (5857682004864).

Almost surely, 2^{20501887017017} is an apocalyptic number.

It is an amenable number.

20501887017017 is a deficient number, since it is larger than the sum of its proper divisors (2928841002439).

20501887017017 is an equidigital number, since it uses as much as digits as its factorization.

20501887017017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2928841002438.

The product of its (nonzero) digits is 219520, while the sum is 47.

The spelling of 20501887017017 in words is "twenty trillion, five hundred one billion, eight hundred eighty-seven million, seventeen thousand, seventeen".