20125720774717 has 8 divisors (see below), whose sum is σ = 20228232281400. Its totient is φ = 20023212808704.

The previous prime is 20125720774711. The next prime is 20125720774721. The reversal of 20125720774717 is 71747702752102.

It can be written as a sum of positive squares in 4 ways, for example, as 2302074873081 + 17823645901636 = 1517259^2 + 4221806^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20125720774717 - 2¹¹ = 20125720772669 is a prime.

It is a super-3 number, since 3×20125720774717³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20125720774711) 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 7 ways as a sum of consecutive naturals, for example, 10911409 + ... + 12621817.

It is an arithmetic number, because the mean of its divisors is an integer number (2528529035175).

Almost surely, 2^{20125720774717} is an apocalyptic number.

It is an amenable number.

20125720774717 is a deficient number, since it is larger than the sum of its proper divisors (102511506683).

20125720774717 is a wasteful number, since it uses less digits than its factorization.

20125720774717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770335.

The product of its (nonzero) digits is 2689120, while the sum is 52.

The spelling of 20125720774717 in words is "twenty trillion, one hundred twenty-five billion, seven hundred twenty million, seven hundred seventy-four thousand, seven hundred seventeen".