20811170051 has 8 divisors (see below), whose sum is σ = 23792272224. Its totient is φ = 17832087360.

The previous prime is 20811170021. The next prime is 20811170059. The reversal of 20811170051 is 15007111802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20811170051 - 2¹⁴ = 20811153667 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20811170051.

It is not an unprimeable number, because it can be changed into a prime (20811170059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482720 + ... + 524061.

It is an arithmetic number, because the mean of its divisors is an integer number (2974034028).

Almost surely, 2^20811170051 is an apocalyptic number.

20811170051 is a deficient number, since it is larger than the sum of its proper divisors (2981102173).

20811170051 is a wasteful number, since it uses less digits than its factorization.

20811170051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009741.

The product of its (nonzero) digits is 560, while the sum is 26.

Adding to 20811170051 its reverse (15007111802), we get a palindrome (35818281853).

The spelling of 20811170051 in words is "twenty billion, eight hundred eleven million, one hundred seventy thousand, fifty-one".