20878241 has 2 divisors, whose sum is σ = 20878242. Its totient is φ = 20878240.

The previous prime is 20878213. The next prime is 20878267. The reversal of 20878241 is 14287802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20214016 + 664225 = 4496^2 + 815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20878241 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20878198 and 20878207.

It is not a weakly prime, because it can be changed into another prime (20878201) 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, 10439120 + 10439121.

It is an arithmetic number, because the mean of its divisors is an integer number (10439121).

Almost surely, 2^20878241 is an apocalyptic number.

It is an amenable number.

20878241 is a deficient number, since it is larger than the sum of its proper divisors (1).

20878241 is an equidigital number, since it uses as much as digits as its factorization.

20878241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 20878241 is about 4569.2713861184. The cubic root of 20878241 is about 275.3581713169.

The spelling of 20878241 in words is "twenty million, eight hundred seventy-eight thousand, two hundred forty-one".