20716916909056 has 33 divisors (see below), whose sum is σ = 41413893615129. Its totient is φ = 10358385629184.

The previous prime is 20716916909033. The next prime is 20716916909173. The reversal of 20716916909056 is 65090961961702.

The square root of 20716916909056 is 4551584.

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

It can be written as a sum of positive squares in only one way, i.e., 16173266560000 + 4543650349056 = 4021600^2 + 2131584^2 .

It is a super-2 number, since 2×20716916909056² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20716916908985 and 20716916909003.

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 2 ways as a sum of consecutive naturals, for example, 145579570 + ... + 145721806.

Almost surely, 2^{20716916909056} is an apocalyptic number.

20716916909056 is the 4551584-th square number.

It is an amenable number.

20716916909056 is a deficient number, since it is larger than the sum of its proper divisors (20696976706073).

20716916909056 is an frugal number, since it uses more digits than its factorization.

20716916909056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284494 (or 142239 counting only the distinct ones).

The product of its (nonzero) digits is 11022480, while the sum is 61.

The spelling of 20716916909056 in words is "twenty trillion, seven hundred sixteen billion, nine hundred sixteen million, nine hundred nine thousand, fifty-six".