20963638 has 4 divisors (see below), whose sum is σ = 31445460. Its totient is φ = 10481818.

The previous prime is 20963633. The next prime is 20963639. The reversal of 20963638 is 83636902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83636902 = 2 ⋅41818451.

It is a junction number, because it is equal to n+sod(n) for n = 20963597 and 20963606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20963633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5240908 + ... + 5240911.

It is an arithmetic number, because the mean of its divisors is an integer number (7861365).

Almost surely, 2^20963638 is an apocalyptic number.

20963638 is a deficient number, since it is larger than the sum of its proper divisors (10481822).

20963638 is a wasteful number, since it uses less digits than its factorization.

20963638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10481821.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 20963638 is about 4578.6065565847. The cubic root of 20963638 is about 275.7330875447.

The spelling of 20963638 in words is "twenty million, nine hundred sixty-three thousand, six hundred thirty-eight".