20691222909 has 8 divisors (see below), whose sum is σ = 31529482560. Its totient is φ = 11823555936.

The previous prime is 20691222863. The next prime is 20691222911. The reversal of 20691222909 is 90922219602.

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

It is not a de Polignac number, because 20691222909 - 2⁷ = 20691222781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20691223909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 492648144 + ... + 492648185.

It is an arithmetic number, because the mean of its divisors is an integer number (3941185320).

Almost surely, 2^20691222909 is an apocalyptic number.

It is an amenable number.

20691222909 is a deficient number, since it is larger than the sum of its proper divisors (10838259651).

20691222909 is an equidigital number, since it uses as much as digits as its factorization.

20691222909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985296339.

The product of its (nonzero) digits is 69984, while the sum is 42.

The spelling of 20691222909 in words is "twenty billion, six hundred ninety-one million, two hundred twenty-two thousand, nine hundred nine".