20711104634657 has 4 divisors (see below), whose sum is σ = 20714918137536. Its totient is φ = 20707291131780.

The previous prime is 20711104634569. The next prime is 20711104634681. The reversal of 20711104634657 is 75643640111702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20711104634657 - 2¹⁴ = 20711104618273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20711104034657) 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, 1906743293 + ... + 1906754154.

It is an arithmetic number, because the mean of its divisors is an integer number (5178729534384).

Almost surely, 2^{20711104634657} is an apocalyptic number.

It is an amenable number.

20711104634657 is a deficient number, since it is larger than the sum of its proper divisors (3813502879).

20711104634657 is an equidigital number, since it uses as much as digits as its factorization.

20711104634657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3813502878.

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 20711104634657 in words is "twenty trillion, seven hundred eleven billion, one hundred four million, six hundred thirty-four thousand, six hundred fifty-seven".