20963601 has 24 divisors (see below), whose sum is σ = 32281704. Its totient is φ = 13063680.

The previous prime is 20963597. The next prime is 20963633. The reversal of 20963601 is 10636902.

It is a happy number.

20963601 is a `hidden beast` number, since 20 + 9 + 636 + 0 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1382976 + 19580625 = 1176^2 + 4425^2 .

It is not a de Polignac number, because 20963601 - 2² = 20963597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20963671) 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 23 ways as a sum of consecutive naturals, for example, 27315 + ... + 28071.

It is an arithmetic number, because the mean of its divisors is an integer number (1345071).

Almost surely, 2^20963601 is an apocalyptic number.

It is an amenable number.

20963601 is a deficient number, since it is larger than the sum of its proper divisors (11318103).

20963601 is a wasteful number, since it uses less digits than its factorization.

20963601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961 (or 958 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 20963601 is about 4578.6025160523. The cubic root of 20963601 is about 275.7329253253.

The spelling of 20963601 in words is "twenty million, nine hundred sixty-three thousand, six hundred one".