20126256103565 has 8 divisors (see below), whose sum is σ = 24482349890808. Its totient is φ = 15880443171840.

The previous prime is 20126256103561. The next prime is 20126256103601. The reversal of 20126256103565 is 56530165262102.

It can be written as a sum of positive squares in 4 ways, for example, as 184297631401 + 19941958472164 = 429299^2 + 4465642^2 .

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

It is not a de Polignac number, because 20126256103565 - 2² = 20126256103561 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 (20126256103561) 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, 27570213476 + ... + 27570214205.

It is an arithmetic number, because the mean of its divisors is an integer number (3060293736351).

Almost surely, 2^{20126256103565} is an apocalyptic number.

It is an amenable number.

20126256103565 is a deficient number, since it is larger than the sum of its proper divisors (4356093787243).

20126256103565 is an equidigital number, since it uses as much as digits as its factorization.

20126256103565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55140427759.

The product of its (nonzero) digits is 648000, while the sum is 44.

The spelling of 20126256103565 in words is "twenty trillion, one hundred twenty-six billion, two hundred fifty-six million, one hundred three thousand, five hundred sixty-five".