20636649841 has 8 divisors (see below), whose sum is σ = 21204930240. Its totient is φ = 20068923888.

The previous prime is 20636649829. The next prime is 20636649853. The reversal of 20636649841 is 14894663602.

It is an interprime number because it is at equal distance from previous prime (20636649829) and next prime (20636649853).

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

It is a cyclic number.

It is not a de Polignac number, because 20636649841 - 2¹⁷ = 20636518769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20636649821) 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, 62581 + ... + 212578.

It is an arithmetic number, because the mean of its divisors is an integer number (2650616280).

Almost surely, 2^20636649841 is an apocalyptic number.

It is an amenable number.

20636649841 is a deficient number, since it is larger than the sum of its proper divisors (568280399).

20636649841 is a wasteful number, since it uses less digits than its factorization.

20636649841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277223.

The product of its (nonzero) digits is 1492992, while the sum is 49.

The spelling of 20636649841 in words is "twenty billion, six hundred thirty-six million, six hundred forty-nine thousand, eight hundred forty-one".