20641919109 has 8 divisors (see below), whose sum is σ = 31454352960. Its totient is φ = 11795382336.

The previous prime is 20641919107. The next prime is 20641919113. The reversal of 20641919109 is 90191914602.

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 20641919109 - 2¹ = 20641919107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20641919107) 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, 491474244 + ... + 491474285.

It is an arithmetic number, because the mean of its divisors is an integer number (3931794120).

Almost surely, 2^20641919109 is an apocalyptic number.

It is an amenable number.

20641919109 is a deficient number, since it is larger than the sum of its proper divisors (10812433851).

20641919109 is an equidigital number, since it uses as much as digits as its factorization.

20641919109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982948539.

The product of its (nonzero) digits is 34992, while the sum is 42.

The spelling of 20641919109 in words is "twenty billion, six hundred forty-one million, nine hundred nineteen thousand, one hundred nine".