20644501241 has 16 divisors (see below), whose sum is σ = 26095340544. Its totient is φ = 15892645824.

The previous prime is 20644501231. The next prime is 20644501247. The reversal of 20644501241 is 14210544602.

It is a cyclic number.

It is not a de Polignac number, because 20644501241 - 2¹⁸ = 20644239097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20644501247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3062345 + ... + 3069078.

It is an arithmetic number, because the mean of its divisors is an integer number (1630958784).

Almost surely, 2^20644501241 is an apocalyptic number.

It is an amenable number.

20644501241 is a deficient number, since it is larger than the sum of its proper divisors (5450839303).

20644501241 is a wasteful number, since it uses less digits than its factorization.

20644501241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6131480.

The product of its (nonzero) digits is 7680, while the sum is 29.

The spelling of 20644501241 in words is "twenty billion, six hundred forty-four million, five hundred one thousand, two hundred forty-one".