20802636378167 has 4 divisors (see below), whose sum is σ = 23774441575056. Its totient is φ = 17830831181280.

The previous prime is 20802636378143. The next prime is 20802636378193. The reversal of 20802636378167 is 76187363620802.

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

It is a cyclic number.

It is not a de Polignac number, because 20802636378167 - 2¹² = 20802636374071 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 (20802636378067) 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, 1485902598434 + ... + 1485902598447.

It is an arithmetic number, because the mean of its divisors is an integer number (5943610393764).

Almost surely, 2^{20802636378167} is an apocalyptic number.

20802636378167 is a deficient number, since it is larger than the sum of its proper divisors (2971805196889).

20802636378167 is an equidigital number, since it uses as much as digits as its factorization.

20802636378167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971805196888.

The product of its (nonzero) digits is 24385536, while the sum is 59.

Adding to 20802636378167 its reverse (76187363620802), we get a palindrome (96989999998969).

The spelling of 20802636378167 in words is "twenty trillion, eight hundred two billion, six hundred thirty-six million, three hundred seventy-eight thousand, one hundred sixty-seven".