20281508163 has 32 divisors (see below), whose sum is σ = 34601233920. Its totient is φ = 11500950240.

The previous prime is 20281508131. The next prime is 20281508189. The reversal of 20281508163 is 36180518202.

It is a happy number.

It is not a de Polignac number, because 20281508163 - 2⁵ = 20281508131 is a prime.

It is a super-2 number, since 2×20281508163² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20281508363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 384820 + ... + 434337.

It is an arithmetic number, because the mean of its divisors is an integer number (1081288560).

Almost surely, 2^20281508163 is an apocalyptic number.

20281508163 is a deficient number, since it is larger than the sum of its proper divisors (14319725757).

20281508163 is a wasteful number, since it uses less digits than its factorization.

20281508163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819304 (or 819298 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 20281508163 in words is "twenty billion, two hundred eighty-one million, five hundred eight thousand, one hundred sixty-three".