20678234251 has 2 divisors, whose sum is σ = 20678234252. Its totient is φ = 20678234250.

The previous prime is 20678234243. The next prime is 20678234309. The reversal of 20678234251 is 15243287602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20678234251 - 2³ = 20678234243 is a prime.

It is not a weakly prime, because it can be changed into another prime (20678234221) 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, 10339117125 + 10339117126.

It is an arithmetic number, because the mean of its divisors is an integer number (10339117126).

Almost surely, 2^20678234251 is an apocalyptic number.

20678234251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20678234251 is an equidigital number, since it uses as much as digits as its factorization.

20678234251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 20678234251 in words is "twenty billion, six hundred seventy-eight million, two hundred thirty-four thousand, two hundred fifty-one".