20969663 has 12 divisors (see below), whose sum is σ = 24824184. Its totient is φ = 17595600.

The previous prime is 20969623. The next prime is 20969677. The reversal of 20969663 is 36696902.

It is not a de Polignac number, because 20969663 - 2²² = 16775359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20969663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20969623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5093 + ... + 8238.

It is an arithmetic number, because the mean of its divisors is an integer number (2068682).

Almost surely, 2^20969663 is an apocalyptic number.

20969663 is a deficient number, since it is larger than the sum of its proper divisors (3854521).

20969663 is a wasteful number, since it uses less digits than its factorization.

20969663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13366 (or 13355 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 20969663 is about 4579.2644605875. The cubic root of 20969663 is about 275.7595004655.

The spelling of 20969663 in words is "twenty million, nine hundred sixty-nine thousand, six hundred sixty-three".