20874851 has 2 divisors, whose sum is σ = 20874852. Its totient is φ = 20874850.

The previous prime is 20874839. The next prime is 20874853. The reversal of 20874851 is 15847802.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20874851 is a prime.

Together with 20874853, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20874853) 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, 10437425 + 10437426.

It is an arithmetic number, because the mean of its divisors is an integer number (10437426).

Almost surely, 2^20874851 is an apocalyptic number.

20874851 is a deficient number, since it is larger than the sum of its proper divisors (1).

20874851 is an equidigital number, since it uses as much as digits as its factorization.

20874851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 20874851 is about 4568.9004147606. The cubic root of 20874851 is about 275.3432672081.

The spelling of 20874851 in words is "twenty million, eight hundred seventy-four thousand, eight hundred fifty-one".