20920597801216 has 81 divisors (see below), whose sum is σ = 41916807323139. Its totient is φ = 10421036508672.

The previous prime is 20920597801211. The next prime is 20920597801217. The reversal of 20920597801216 is 61210879502902.

The square root of 20920597801216 is 4573904.

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 (20920597801211) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 35639859675 + ... + 35639860261.

Almost surely, 2^{20920597801216} is an apocalyptic number.

20920597801216 is the 4573904-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20920597801216

20920597801216 is an abundant number, since it is smaller than the sum of its proper divisors (20996209521923).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20920597801216 is an frugal number, since it uses more digits than its factorization.

20920597801216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2164 (or 1076 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 20920597801216 in words is "twenty trillion, nine hundred twenty billion, five hundred ninety-seven million, eight hundred one thousand, two hundred sixteen".