20891041 has 2 divisors, whose sum is σ = 20891042. Its totient is φ = 20891040.

The previous prime is 20891033. The next prime is 20891047. The reversal of 20891041 is 14019802.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14745600 + 6145441 = 3840^2 + 2479^2 .

It is a cyclic number.

It is not a de Polignac number, because 20891041 - 2³ = 20891033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20890997 and 20891015.

It is not a weakly prime, because it can be changed into another prime (20891047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10445520 + 10445521.

It is an arithmetic number, because the mean of its divisors is an integer number (10445521).

Almost surely, 2^20891041 is an apocalyptic number.

It is an amenable number.

20891041 is a deficient number, since it is larger than the sum of its proper divisors (1).

20891041 is an equidigital number, since it uses as much as digits as its factorization.

20891041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 20891041 is about 4570.6718324553. The cubic root of 20891041 is about 275.4144318764.

The spelling of 20891041 in words is "twenty million, eight hundred ninety-one thousand, forty-one".