20597703361 has 3 divisors (see below), whose sum is σ = 20597846881. Its totient is φ = 20597559842.

The previous prime is 20597703359. The next prime is 20597703439. The reversal of 20597703361 is 16330779502.

It is a happy number.

The square root of 20597703361 is 143519.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 20597703361 - 2¹ = 20597703359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20597703311) 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, 71760 + ... + 215278.

Almost surely, 2^20597703361 is an apocalyptic number.

20597703361 is the 143519-th square number.

20597703361 is the 71760-th centered octagonal number.

It is an amenable number.

20597703361 is a deficient number, since it is larger than the sum of its proper divisors (143520).

20597703361 is an frugal number, since it uses more digits than its factorization.

20597703361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287038 (or 143519 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 43.

The spelling of 20597703361 in words is "twenty billion, five hundred ninety-seven million, seven hundred three thousand, three hundred sixty-one".