20641206211 has 4 divisors (see below), whose sum is σ = 20642643952. Its totient is φ = 20639768472.

The previous prime is 20641206203. The next prime is 20641206259. The reversal of 20641206211 is 11260214602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20641206211 - 2³ = 20641206203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20641203211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697116 + ... + 726121.

It is an arithmetic number, because the mean of its divisors is an integer number (5160660988).

Almost surely, 2^20641206211 is an apocalyptic number.

20641206211 is a deficient number, since it is larger than the sum of its proper divisors (1437741).

20641206211 is a wasteful number, since it uses less digits than its factorization.

20641206211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437740.

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 20641206211 in words is "twenty billion, six hundred forty-one million, two hundred six thousand, two hundred eleven".