20644406241 has 4 divisors (see below), whose sum is σ = 27525874992. Its totient is φ = 13762937492.

The previous prime is 20644406239. The next prime is 20644406257. The reversal of 20644406241 is 14260444602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20644406241 - 2¹ = 20644406239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20644406231) 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, 3440734371 + ... + 3440734376.

It is an arithmetic number, because the mean of its divisors is an integer number (6881468748).

Almost surely, 2^20644406241 is an apocalyptic number.

It is an amenable number.

20644406241 is a deficient number, since it is larger than the sum of its proper divisors (6881468751).

20644406241 is an equidigital number, since it uses as much as digits as its factorization.

20644406241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6881468750.

The product of its (nonzero) digits is 36864, while the sum is 33.

The spelling of 20644406241 in words is "twenty billion, six hundred forty-four million, four hundred six thousand, two hundred forty-one".