20581082169 has 8 divisors (see below), whose sum is σ = 28885729440. Its totient is φ = 12998578176.

The previous prime is 20581082167. The next prime is 20581082183. The reversal of 20581082169 is 96128018502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20581082169 - 2¹ = 20581082167 is a prime.

It is a super-2 number, since 2×20581082169² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20581082169.

It is not an unprimeable number, because it can be changed into a prime (20581082167) 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 7 ways as a sum of consecutive naturals, for example, 180535752 + ... + 180535865.

It is an arithmetic number, because the mean of its divisors is an integer number (3610716180).

Almost surely, 2^20581082169 is an apocalyptic number.

It is an amenable number.

20581082169 is a deficient number, since it is larger than the sum of its proper divisors (8304647271).

20581082169 is a wasteful number, since it uses less digits than its factorization.

20581082169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361071639.

The product of its (nonzero) digits is 69120, while the sum is 42.

The spelling of 20581082169 in words is "twenty billion, five hundred eighty-one million, eighty-two thousand, one hundred sixty-nine".