20565423677741 has 8 divisors (see below), whose sum is σ = 21837547481400. Its totient is φ = 19300232429568.

The previous prime is 20565423677713. The next prime is 20565423677761. The reversal of 20565423677741 is 14777632456502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6291799655716 + 14273624022025 = 2508346^2 + 3778045^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20565423677741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20565423677761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1733132756 + ... + 1733144621.

It is an arithmetic number, because the mean of its divisors is an integer number (2729693435175).

Almost surely, 2^{20565423677741} is an apocalyptic number.

It is an amenable number.

20565423677741 is a deficient number, since it is larger than the sum of its proper divisors (1272123803659).

20565423677741 is a wasteful number, since it uses less digits than its factorization.

20565423677741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3466277743.

The product of its (nonzero) digits is 59270400, while the sum is 59.

The spelling of 20565423677741 in words is "twenty trillion, five hundred sixty-five billion, four hundred twenty-three million, six hundred seventy-seven thousand, seven hundred forty-one".