20963671 has 2 divisors, whose sum is σ = 20963672. Its totient is φ = 20963670.

The previous prime is 20963659. The next prime is 20963681. The reversal of 20963671 is 17636902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20963671 - 2⁵ = 20963639 is a prime.

It is equal to p_1327786 and since 20963671 and 1327786 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20963681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10481835 + 10481836.

It is an arithmetic number, because the mean of its divisors is an integer number (10481836).

Almost surely, 2^20963671 is an apocalyptic number.

20963671 is a deficient number, since it is larger than the sum of its proper divisors (1).

20963671 is an equidigital number, since it uses as much as digits as its factorization.

20963671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20963671 is about 4578.6101602997. The cubic root of 20963671 is about 275.7332322268.

The spelling of 20963671 in words is "twenty million, nine hundred sixty-three thousand, six hundred seventy-one".