20963633 has 2 divisors, whose sum is σ = 20963634. Its totient is φ = 20963632.

The previous prime is 20963597. The next prime is 20963639. The reversal of 20963633 is 33636902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16834609 + 4129024 = 4103^2 + 2032^2 .

It is a cyclic number.

It is not a de Polignac number, because 20963633 - 2⁸ = 20963377 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20963633.

It is not a weakly prime, because it can be changed into another prime (20963639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10481816 + 10481817.

It is an arithmetic number, because the mean of its divisors is an integer number (10481817).

Almost surely, 2^20963633 is an apocalyptic number.

It is an amenable number.

20963633 is a deficient number, since it is larger than the sum of its proper divisors (1).

20963633 is an equidigital number, since it uses as much as digits as its factorization.

20963633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 32.

The square root of 20963633 is about 4578.6060105670. The cubic root of 20963633 is about 275.7330656232.

The spelling of 20963633 in words is "twenty million, nine hundred sixty-three thousand, six hundred thirty-three".