20956615696 has 15 divisors (see below), whose sum is σ = 40604564863. Its totient is φ = 10478018320.

The previous prime is 20956615681. The next prime is 20956615699. The reversal of 20956615696 is 69651665902.

The square root of 20956615696 is 144764.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20956615699) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 560961 + ... + 597151.

Almost surely, 2^20956615696 is an apocalyptic number.

20956615696 is the 144764-th square number.

It is an amenable number.

20956615696 is a deficient number, since it is larger than the sum of its proper divisors (19647949167).

20956615696 is an frugal number, since it uses more digits than its factorization.

20956615696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72390 (or 36193 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 55.

The spelling of 20956615696 in words is "twenty billion, nine hundred fifty-six million, six hundred fifteen thousand, six hundred ninety-six".