20215543470017 has 16 divisors (see below), whose sum is σ = 23859013718400. Its totient is φ = 17118842294736.

The previous prime is 20215543469993. The next prime is 20215543470029. The reversal of 20215543470017 is 71007434551202.

It is not a de Polignac number, because 20215543470017 - 2⁸ = 20215543469761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20215543473017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355016378 + ... + 355073315.

It is an arithmetic number, because the mean of its divisors is an integer number (1491188357400).

Almost surely, 2^{20215543470017} is an apocalyptic number.

It is an amenable number.

20215543470017 is a deficient number, since it is larger than the sum of its proper divisors (3643470248383).

20215543470017 is an frugal number, since it uses more digits than its factorization.

20215543470017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710089797 (or 710089783 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 41.

The spelling of 20215543470017 in words is "twenty trillion, two hundred fifteen billion, five hundred forty-three million, four hundred seventy thousand, seventeen".