20516421363 has 16 divisors (see below), whose sum is σ = 27756911520. Its totient is φ = 13478173184.

The previous prime is 20516421323. The next prime is 20516421379. The reversal of 20516421363 is 36312461502.

It is a cyclic number.

It is not a de Polignac number, because 20516421363 - 2²⁸ = 20247985907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20516421323) 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, 116268 + ... + 233561.

It is an arithmetic number, because the mean of its divisors is an integer number (1734806970).

Almost surely, 2^20516421363 is an apocalyptic number.

20516421363 is a deficient number, since it is larger than the sum of its proper divisors (7240490157).

20516421363 is a wasteful number, since it uses less digits than its factorization.

20516421363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350118.

The product of its (nonzero) digits is 25920, while the sum is 33.

Adding to 20516421363 its reverse (36312461502), we get a palindrome (56828882865).

The spelling of 20516421363 in words is "twenty billion, five hundred sixteen million, four hundred twenty-one thousand, three hundred sixty-three".