20968353663 has 8 divisors (see below), whose sum is σ = 27969353088. Its totient is φ = 13973128344.

The previous prime is 20968353617. The next prime is 20968353713. The reversal of 20968353663 is 36635386902.

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

It is not a de Polignac number, because 20968353663 - 2⁹ = 20968353151 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20968353463) 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, 1435045 + ... + 1449582.

It is an arithmetic number, because the mean of its divisors is an integer number (3496169136).

Almost surely, 2^20968353663 is an apocalyptic number.

20968353663 is a deficient number, since it is larger than the sum of its proper divisors (7000999425).

20968353663 is a wasteful number, since it uses less digits than its factorization.

20968353663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887053.

The product of its (nonzero) digits is 4199040, while the sum is 51.

The spelling of 20968353663 in words is "twenty billion, nine hundred sixty-eight million, three hundred fifty-three thousand, six hundred sixty-three".