20553534163 has 4 divisors (see below), whose sum is σ = 20890477408. Its totient is φ = 20216590920.

The previous prime is 20553534121. The next prime is 20553534167. The reversal of 20553534163 is 36143535502.

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-20553534163 is a prime.

It is a super-2 number, since 2×20553534163² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20553534167) 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, 168471531 + ... + 168471652.

It is an arithmetic number, because the mean of its divisors is an integer number (5222619352).

Almost surely, 2^20553534163 is an apocalyptic number.

20553534163 is a deficient number, since it is larger than the sum of its proper divisors (336943245).

20553534163 is an equidigital number, since it uses as much as digits as its factorization.

20553534163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336943244.

The product of its (nonzero) digits is 162000, while the sum is 37.

The spelling of 20553534163 in words is "twenty billion, five hundred fifty-three million, five hundred thirty-four thousand, one hundred sixty-three".