20405342163 has 32 divisors (see below), whose sum is σ = 29802009600. Its totient is φ = 12374431776.

The previous prime is 20405342159. The next prime is 20405342171. The reversal of 20405342163 is 36124350402.

It is not a de Polignac number, because 20405342163 - 2² = 20405342159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20405342163.

It is not an unprimeable number, because it can be changed into a prime (20405342143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74056 + ... + 215162.

It is an arithmetic number, because the mean of its divisors is an integer number (931312800).

Almost surely, 2^20405342163 is an apocalyptic number.

20405342163 is a deficient number, since it is larger than the sum of its proper divisors (9396667437).

20405342163 is a wasteful number, since it uses less digits than its factorization.

20405342163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141231.

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 20405342163 its reverse (36124350402), we get a palindrome (56529692565).

The spelling of 20405342163 in words is "twenty billion, four hundred five million, three hundred forty-two thousand, one hundred sixty-three".