20538333836705 has 4 divisors (see below), whose sum is σ = 24646000604052. Its totient is φ = 16430667069360.

The previous prime is 20538333836701. The next prime is 20538333836731. The reversal of 20538333836705 is 50763833383502.

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 3932285034001 + 16606048802704 = 1982999^2 + 4075052^2 .

It is not a de Polignac number, because 20538333836705 - 2² = 20538333836701 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20538333836701) 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, 2053833383666 + ... + 2053833383675.

It is an arithmetic number, because the mean of its divisors is an integer number (6161500151013).

Almost surely, 2^{20538333836705} is an apocalyptic number.

It is an amenable number.

20538333836705 is a deficient number, since it is larger than the sum of its proper divisors (4107666767347).

20538333836705 is an equidigital number, since it uses as much as digits as its factorization.

20538333836705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4107666767346.

The product of its (nonzero) digits is 32659200, while the sum is 56.

The spelling of 20538333836705 in words is "twenty trillion, five hundred thirty-eight billion, three hundred thirty-three million, eight hundred thirty-six thousand, seven hundred five".