20816605097 has 4 divisors (see below), whose sum is σ = 20817709440. Its totient is φ = 20815500756.

The previous prime is 20816605087. The next prime is 20816605099. The reversal of 20816605097 is 79050661802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20816605097 - 2⁸ = 20816604841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20816605099) 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 3 ways as a sum of consecutive naturals, for example, 523397 + ... + 561762.

It is an arithmetic number, because the mean of its divisors is an integer number (5204427360).

Almost surely, 2^20816605097 is an apocalyptic number.

It is an amenable number.

20816605097 is a deficient number, since it is larger than the sum of its proper divisors (1104343).

20816605097 is a wasteful number, since it uses less digits than its factorization.

20816605097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104342.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 20816605097 in words is "twenty billion, eight hundred sixteen million, six hundred five thousand, ninety-seven".