20963851 has 2 divisors, whose sum is σ = 20963852. Its totient is φ = 20963850.

The previous prime is 20963849. The next prime is 20963869. The reversal of 20963851 is 15836902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20963851 - 2¹ = 20963849 is a prime.

Together with 20963849, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20963881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10481925 + 10481926.

It is an arithmetic number, because the mean of its divisors is an integer number (10481926).

Almost surely, 2^20963851 is an apocalyptic number.

20963851 is a deficient number, since it is larger than the sum of its proper divisors (1).

20963851 is an equidigital number, since it uses as much as digits as its factorization.

20963851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20963851 is about 4578.6298168775. The cubic root of 20963851 is about 275.7340213990.

The spelling of 20963851 in words is "twenty million, nine hundred sixty-three thousand, eight hundred fifty-one".