20900081099 has 2 divisors, whose sum is σ = 20900081100. Its totient is φ = 20900081098.

The previous prime is 20900081089. The next prime is 20900081123. The reversal of 20900081099 is 99018000902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20900081099 - 2²⁰ = 20899032523 is a prime.

It is not a weakly prime, because it can be changed into another prime (20900081029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10450040549 + 10450040550.

It is an arithmetic number, because the mean of its divisors is an integer number (10450040550).

Almost surely, 2^20900081099 is an apocalyptic number.

20900081099 is a deficient number, since it is larger than the sum of its proper divisors (1).

20900081099 is an equidigital number, since it uses as much as digits as its factorization.

20900081099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 20900081099 in words is "twenty billion, nine hundred million, eighty-one thousand, ninety-nine".