20005216232464 has 20 divisors (see below), whose sum is σ = 38761103216556. Its totient is φ = 10002350886272.

The previous prime is 20005216232447. The next prime is 20005216232483. The reversal of 20005216232464 is 46423261250002.

It can be written as a sum of positive squares in 2 ways, for example, as 8956851840000 + 11048364392464 = 2992800^2 + 3323908^2 .

It is a super-3 number, since 3×20005216232464³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 15434479 + ... + 16680334.

Almost surely, 2^{20005216232464} is an apocalyptic number.

It is an amenable number.

20005216232464 is a deficient number, since it is larger than the sum of its proper divisors (18755886984092).

20005216232464 is a wasteful number, since it uses less digits than its factorization.

20005216232464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32153754 (or 32153748 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

Adding to 20005216232464 its reverse (46423261250002), we get a palindrome (66428477482466).

The spelling of 20005216232464 in words is "twenty trillion, five billion, two hundred sixteen million, two hundred thirty-two thousand, four hundred sixty-four".