20090856760729 has 4 divisors (see below), whose sum is σ = 20154234858084. Its totient is φ = 20027478663376.

The previous prime is 20090856760693. The next prime is 20090856760771. The reversal of 20090856760729 is 92706765809002.

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 2335395240000 + 17755461520729 = 1528200^2 + 4213723^2 .

It is a cyclic number.

It is not a de Polignac number, because 20090856760729 - 2³¹ = 20088709277081 is a prime.

It is a super-2 number, since 2×20090856760729² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20090856760789) 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 3 ways as a sum of consecutive naturals, for example, 31689048202 + ... + 31689048835.

It is an arithmetic number, because the mean of its divisors is an integer number (5038558714521).

Almost surely, 2^{20090856760729} is an apocalyptic number.

It is an amenable number.

20090856760729 is a deficient number, since it is larger than the sum of its proper divisors (63378097355).

20090856760729 is an equidigital number, since it uses as much as digits as its factorization.

20090856760729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63378097354.

The product of its (nonzero) digits is 22861440, while the sum is 61.

The spelling of 20090856760729 in words is "twenty trillion, ninety billion, eight hundred fifty-six million, seven hundred sixty thousand, seven hundred twenty-nine".