20963656 has 16 divisors (see below), whose sum is σ = 44922240. Its totient is φ = 8984400.

The previous prime is 20963653. The next prime is 20963659. The reversal of 20963656 is 65636902.

It is an interprime number because it is at equal distance from previous prime (20963653) and next prime (20963659).

It is not an unprimeable number, because it can be changed into a prime (20963653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187120 + ... + 187231.

It is an arithmetic number, because the mean of its divisors is an integer number (2807640).

Almost surely, 2^20963656 is an apocalyptic number.

It is an amenable number.

20963656 is an abundant number, since it is smaller than the sum of its proper divisors (23958584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20963656 is a wasteful number, since it uses less digits than its factorization.

20963656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374364 (or 374360 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 20963656 is about 4578.6085222478. The cubic root of 20963656 is about 275.7331664623.

The spelling of 20963656 in words is "twenty million, nine hundred sixty-three thousand, six hundred fifty-six".