20963644 has 24 divisors (see below), whose sum is σ = 40183920. Its totient is φ = 9510144.

The previous prime is 20963639. The next prime is 20963653. The reversal of 20963644 is 44636902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349 + ... + 6484.

It is an arithmetic number, because the mean of its divisors is an integer number (1674330).

Almost surely, 2^20963644 is an apocalyptic number.

It is an amenable number.

20963644 is a deficient number, since it is larger than the sum of its proper divisors (19220276).

20963644 is a wasteful number, since it uses less digits than its factorization.

20963644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6909 (or 6907 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 20963644 is about 4578.6072118058. The cubic root of 20963644 is about 275.7331138506.

The spelling of 20963644 in words is "twenty million, nine hundred sixty-three thousand, six hundred forty-four".