20215340563 has 8 divisors (see below), whose sum is σ = 22522314240. Its totient is φ = 17986569480.

The previous prime is 20215340539. The next prime is 20215340599. The reversal of 20215340563 is 36504351202.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-20215340563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20215340863) by changing a digit.

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, 19550103 + ... + 19551136.

It is an arithmetic number, because the mean of its divisors is an integer number (2815289280).

Almost surely, 2^20215340563 is an apocalyptic number.

20215340563 is a deficient number, since it is larger than the sum of its proper divisors (2306973677).

20215340563 is a wasteful number, since it uses less digits than its factorization.

20215340563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39101297.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 20215340563 its reverse (36504351202), we get a palindrome (56719691765).

The spelling of 20215340563 in words is "twenty billion, two hundred fifteen million, three hundred forty thousand, five hundred sixty-three".