20727126652861 has 4 divisors (see below), whose sum is σ = 20727717389500. Its totient is φ = 20726535916224.

The previous prime is 20727126652849. The next prime is 20727126652889. The reversal of 20727126652861 is 16825662172702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18155013156900 + 2572113495961 = 4260870^2 + 1603781^2 .

It is a cyclic number.

It is not a de Polignac number, because 20727126652861 - 2³⁵ = 20692766914493 is a prime.

It is a super-2 number, since 2×20727126652861² (a number of 27 digits) contains 22 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 (20727126352861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295315686 + ... + 295385863.

It is an arithmetic number, because the mean of its divisors is an integer number (5181929347375).

Almost surely, 2^{20727126652861} is an apocalyptic number.

It is an amenable number.

20727126652861 is a deficient number, since it is larger than the sum of its proper divisors (590736639).

20727126652861 is an equidigital number, since it uses as much as digits as its factorization.

20727126652861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590736638.

The product of its (nonzero) digits is 6773760, while the sum is 55.

The spelling of 20727126652861 in words is "twenty trillion, seven hundred twenty-seven billion, one hundred twenty-six million, six hundred fifty-two thousand, eight hundred sixty-one".