20163116531 has 4 divisors (see below), whose sum is σ = 20205211200. Its totient is φ = 20121021864.

The previous prime is 20163116527. The next prime is 20163116569. The reversal of 20163116531 is 13561136102.

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 20163116531 - 2² = 20163116527 is a prime.

It is a super-2 number, since 2×20163116531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20163116494 and 20163116503.

It is not an unprimeable number, because it can be changed into a prime (20163116581) 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, 21046616 + ... + 21047573.

It is an arithmetic number, because the mean of its divisors is an integer number (5051302800).

Almost surely, 2^20163116531 is an apocalyptic number.

20163116531 is a deficient number, since it is larger than the sum of its proper divisors (42094669).

20163116531 is an equidigital number, since it uses as much as digits as its factorization.

20163116531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42094668.

The product of its (nonzero) digits is 3240, while the sum is 29.

The spelling of 20163116531 in words is "twenty billion, one hundred sixty-three million, one hundred sixteen thousand, five hundred thirty-one".