20013127517261 has 8 divisors (see below), whose sum is σ = 21199595591160. Its totient is φ = 18827684474368.

The previous prime is 20013127517249. The next prime is 20013127517281. The reversal of 20013127517261 is 16271572131002.

It can be written as a sum of positive squares in 4 ways, for example, as 5512606235236 + 14500521282025 = 2347894^2 + 3807955^2 .

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 20013127517261 - 2¹⁰ = 20013127516237 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 (20013127517281) 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, 256217546 + ... + 256295643.

It is an arithmetic number, because the mean of its divisors is an integer number (2649949448895).

Almost surely, 2^{20013127517261} is an apocalyptic number.

It is an amenable number.

20013127517261 is a deficient number, since it is larger than the sum of its proper divisors (1186468073899).

20013127517261 is a wasteful number, since it uses less digits than its factorization.

20013127517261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512515503.

The product of its (nonzero) digits is 35280, while the sum is 38.

Adding to 20013127517261 its reverse (16271572131002), we get a palindrome (36284699648263).

The spelling of 20013127517261 in words is "twenty trillion, thirteen billion, one hundred twenty-seven million, five hundred seventeen thousand, two hundred sixty-one".