20649535663 has 8 divisors (see below), whose sum is σ = 20818933760. Its totient is φ = 20480244120.

The previous prime is 20649535649. The next prime is 20649535679. The reversal of 20649535663 is 36653594602.

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 20649535663 - 2¹³ = 20649527471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20649535603) 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, 388948 + ... + 438838.

It is an arithmetic number, because the mean of its divisors is an integer number (2602366720).

Almost surely, 2^20649535663 is an apocalyptic number.

20649535663 is a deficient number, since it is larger than the sum of its proper divisors (169398097).

20649535663 is a wasteful number, since it uses less digits than its factorization.

20649535663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53277.

The product of its (nonzero) digits is 3499200, while the sum is 49.

The spelling of 20649535663 in words is "twenty billion, six hundred forty-nine million, five hundred thirty-five thousand, six hundred sixty-three".