20962891 has 2 divisors, whose sum is σ = 20962892. Its totient is φ = 20962890.

The previous prime is 20962883. The next prime is 20962897. The reversal of 20962891 is 19826902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20962891 - 2³ = 20962883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20962891.

It is not a weakly prime, because it can be changed into another prime (20962897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10481445 + 10481446.

It is an arithmetic number, because the mean of its divisors is an integer number (10481446).

Almost surely, 2^20962891 is an apocalyptic number.

20962891 is a deficient number, since it is larger than the sum of its proper divisors (1).

20962891 is an equidigital number, since it uses as much as digits as its factorization.

20962891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 20962891 is about 4578.5249808208. The cubic root of 20962891 is about 275.7298124284.

The spelling of 20962891 in words is "twenty million, nine hundred sixty-two thousand, eight hundred ninety-one".