20902249899 has 6 divisors (see below), whose sum is σ = 30192138756. Its totient is φ = 13934833260.

The previous prime is 20902249877. The next prime is 20902249913. The reversal of 20902249899 is 99894220902.

It is not a de Polignac number, because 20902249899 - 2⁵ = 20902249867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20902249399) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1161236097 + ... + 1161236114.

It is an arithmetic number, because the mean of its divisors is an integer number (5032023126).

Almost surely, 2^20902249899 is an apocalyptic number.

20902249899 is a deficient number, since it is larger than the sum of its proper divisors (9289888857).

20902249899 is a wasteful number, since it uses less digits than its factorization.

20902249899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2322472217 (or 2322472214 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 20902249899 in words is "twenty billion, nine hundred two million, two hundred forty-nine thousand, eight hundred ninety-nine".