20216005787 has 8 divisors (see below), whose sum is σ = 21601562400. Its totient is φ = 18852269184.

The previous prime is 20216005781. The next prime is 20216005819. The reversal of 20216005787 is 78750061202.

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

It is a cyclic number.

It is not a de Polignac number, because 20216005787 - 2⁶ = 20216005723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20216005787.

It is not an unprimeable number, because it can be changed into a prime (20216005781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5453087 + ... + 5456792.

It is an arithmetic number, because the mean of its divisors is an integer number (2700195300).

Almost surely, 2^20216005787 is an apocalyptic number.

20216005787 is a deficient number, since it is larger than the sum of its proper divisors (1385556613).

20216005787 is a wasteful number, since it uses less digits than its factorization.

20216005787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10910005.

The product of its (nonzero) digits is 47040, while the sum is 38.

Adding to 20216005787 its reverse (78750061202), we get a palindrome (98966066989).

The spelling of 20216005787 in words is "twenty billion, two hundred sixteen million, five thousand, seven hundred eighty-seven".