20502218667 has 16 divisors (see below), whose sum is σ = 31451155200. Its totient is φ = 11636923872.

The previous prime is 20502218657. The next prime is 20502218707. The reversal of 20502218667 is 76681220502.

It is not a de Polignac number, because 20502218667 - 2²³ = 20493830059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20502218657) 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, 3273033 + ... + 3279290.

It is an arithmetic number, because the mean of its divisors is an integer number (1965697200).

Almost surely, 2^20502218667 is an apocalyptic number.

20502218667 is a deficient number, since it is larger than the sum of its proper divisors (10948936533).

20502218667 is a wasteful number, since it uses less digits than its factorization.

20502218667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6552482.

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 20502218667 in words is "twenty billion, five hundred two million, two hundred eighteen thousand, six hundred sixty-seven".