20217217278736 has 45 divisors (see below), whose sum is σ = 39245327853319. Its totient is φ = 10089427184672.

The previous prime is 20217217278679. The next prime is 20217217278763. The reversal of 20217217278736 is 63787271271202.

The square root of 20217217278736 is 4496356.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 17032195935 + ... + 17032197121.

Almost surely, 2^{20217217278736} is an apocalyptic number.

20217217278736 is the 4496356-th square number.

It is an amenable number.

20217217278736 is a deficient number, since it is larger than the sum of its proper divisors (19028110574583).

20217217278736 is an frugal number, since it uses more digits than its factorization.

20217217278736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4276 (or 2136 counting only the distinct ones).

The product of its (nonzero) digits is 5531904, while the sum is 55.

The spelling of 20217217278736 in words is "twenty trillion, two hundred seventeen billion, two hundred seventeen million, two hundred seventy-eight thousand, seven hundred thirty-six".