20594233619569 has 9 divisors (see below), whose sum is σ = 21166050367371. Its totient is φ = 20037469339800.

The previous prime is 20594233619551. The next prime is 20594233619599. The reversal of 20594233619569 is 96591633249502.

The square root of 20594233619569 is 4538087.

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., 18428003056225 + 2166230563344 = 4292785^2 + 1471812^2 .

It is not a de Polignac number, because 20594233619569 - 2¹³ = 20594233611377 is a prime.

It is a super-2 number, since 2×20594233619569² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20594233619569.

It is not an unprimeable number, because it can be changed into a prime (20594233619599) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 167847894 + ... + 167970544.

Almost surely, 2^{20594233619569} is an apocalyptic number.

20594233619569 is the 4538087-th square number.

20594233619569 is the 2269044-th centered octagonal number.

It is an amenable number.

20594233619569 is a deficient number, since it is larger than the sum of its proper divisors (571816747802).

20594233619569 is an frugal number, since it uses more digits than its factorization.

20594233619569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245376 (or 122688 counting only the distinct ones).

The product of its (nonzero) digits is 94478400, while the sum is 64.

The spelling of 20594233619569 in words is "twenty trillion, five hundred ninety-four billion, two hundred thirty-three million, six hundred nineteen thousand, five hundred sixty-nine".