20982090217 has 16 divisors (see below), whose sum is σ = 24262286400. Its totient is φ = 17933117440.

The previous prime is 20982090209. The next prime is 20982090221. The reversal of 20982090217 is 71209028902.

It is a cyclic number.

It is not a de Polignac number, because 20982090217 - 2³ = 20982090209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20982090217.

It is not an unprimeable number, because it can be changed into a prime (20982090257) 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, 113334 + ... + 234112.

It is an arithmetic number, because the mean of its divisors is an integer number (1516392900).

Almost surely, 2^20982090217 is an apocalyptic number.

It is an amenable number.

20982090217 is a deficient number, since it is larger than the sum of its proper divisors (3280196183).

20982090217 is a wasteful number, since it uses less digits than its factorization.

20982090217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121736.

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 20982090217 in words is "twenty billion, nine hundred eighty-two million, ninety thousand, two hundred seventeen".