20420133165 has 12 divisors (see below), whose sum is σ = 35394897564. Its totient is φ = 10890737664.

The previous prime is 20420133133. The next prime is 20420133191. The reversal of 20420133165 is 56133102402.

It can be written as a sum of positive squares in 2 ways, for example, as 15937295049 + 4482838116 = 126243^2 + 66954^2 .

It is not a de Polignac number, because 20420133165 - 2⁵ = 20420133133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 226890324 + ... + 226890413.

It is an arithmetic number, because the mean of its divisors is an integer number (2949574797).

Almost surely, 2^20420133165 is an apocalyptic number.

It is an amenable number.

20420133165 is a deficient number, since it is larger than the sum of its proper divisors (14974764399).

20420133165 is a wasteful number, since it uses less digits than its factorization.

20420133165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453780748 (or 453780745 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 20420133165 its reverse (56133102402), we get a palindrome (76553235567).

The spelling of 20420133165 in words is "twenty billion, four hundred twenty million, one hundred thirty-three thousand, one hundred sixty-five".