20017020505 has 8 divisors (see below), whose sum is σ = 25284657600. Its totient is φ = 15170794416.

The previous prime is 20017020487. The next prime is 20017020511. The reversal of 20017020505 is 50502071002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20017020505 - 2⁷ = 20017020377 is a prime.

It is a super-2 number, since 2×20017020505² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 105352645 + ... + 105352834.

It is an arithmetic number, because the mean of its divisors is an integer number (3160582200).

Almost surely, 2^20017020505 is an apocalyptic number.

It is an amenable number.

20017020505 is a deficient number, since it is larger than the sum of its proper divisors (5267637095).

20017020505 is a wasteful number, since it uses less digits than its factorization.

20017020505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210705503.

The product of its (nonzero) digits is 700, while the sum is 22.

Adding to 20017020505 its reverse (50502071002), we get a palindrome (70519091507).

The spelling of 20017020505 in words is "twenty billion, seventeen million, twenty thousand, five hundred five".