20005216232401 has 2 divisors, whose sum is σ = 20005216232402. Its totient is φ = 20005216232400.

The previous prime is 20005216232399. The next prime is 20005216232423. The reversal of 20005216232401 is 10423261250002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19561292524225 + 443923708176 = 4422815^2 + 666276^2 .

It is a cyclic number.

It is not a de Polignac number, because 20005216232401 - 2¹ = 20005216232399 is a prime.

It is a super-3 number, since 3×20005216232401³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 20005216232399, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20005216232401.

It is not a weakly prime, because it can be changed into another prime (20005216232431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002608116200 + 10002608116201.

It is an arithmetic number, because the mean of its divisors is an integer number (10002608116201).

Almost surely, 2^{20005216232401} is an apocalyptic number.

It is an amenable number.

20005216232401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20005216232401 is an equidigital number, since it uses as much as digits as its factorization.

20005216232401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 20005216232401 its reverse (10423261250002), we get a palindrome (30428477482403).

The spelling of 20005216232401 in words is "twenty trillion, five billion, two hundred sixteen million, two hundred thirty-two thousand, four hundred one".