20963869 has 2 divisors, whose sum is σ = 20963870. Its totient is φ = 20963868.

The previous prime is 20963851. The next prime is 20963881. The reversal of 20963869 is 96836902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19686969 + 1276900 = 4437^2 + 1130^2 .

It is a cyclic number.

It is not a de Polignac number, because 20963869 - 2⁵ = 20963837 is a prime.

It is a super-2 number, since 2×20963869² = 878967606898322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20963849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10481934 + 10481935.

It is an arithmetic number, because the mean of its divisors is an integer number (10481935).

Almost surely, 2^20963869 is an apocalyptic number.

It is an amenable number.

20963869 is a deficient number, since it is larger than the sum of its proper divisors (1).

20963869 is an equidigital number, since it uses as much as digits as its factorization.

20963869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 20963869 is about 4578.6317825307. The cubic root of 20963869 is about 275.7341003160.

The spelling of 20963869 in words is "twenty million, nine hundred sixty-three thousand, eight hundred sixty-nine".