20605742141167 has 4 divisors (see below), whose sum is σ = 20679072184656. Its totient is φ = 20532412097680.

The previous prime is 20605742141123. The next prime is 20605742141209. The reversal of 20605742141167 is 76114124750602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20605742141167 is a prime.

It is a super-2 number, since 2×20605742141167² (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 (20605742145167) 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, 36665021323 + ... + 36665021884.

It is an arithmetic number, because the mean of its divisors is an integer number (5169768046164).

Almost surely, 2^{20605742141167} is an apocalyptic number.

20605742141167 is a deficient number, since it is larger than the sum of its proper divisors (73330043489).

20605742141167 is an equidigital number, since it uses as much as digits as its factorization.

20605742141167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73330043488.

The product of its (nonzero) digits is 564480, while the sum is 46.

Adding to 20605742141167 its reverse (76114124750602), we get a palindrome (96719866891769).

The spelling of 20605742141167 in words is "twenty trillion, six hundred five billion, seven hundred forty-two million, one hundred forty-one thousand, one hundred sixty-seven".