20678951 has 2 divisors, whose sum is σ = 20678952. Its totient is φ = 20678950.

The previous prime is 20678923. The next prime is 20678981. The reversal of 20678951 is 15987602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20678951 - 2¹⁰ = 20677927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20678921) 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, 10339475 + 10339476.

It is an arithmetic number, because the mean of its divisors is an integer number (10339476).

Almost surely, 2^20678951 is an apocalyptic number.

20678951 is a deficient number, since it is larger than the sum of its proper divisors (1).

20678951 is an equidigital number, since it uses as much as digits as its factorization.

20678951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 20678951 is about 4547.4114614800. The cubic root of 20678951 is about 274.4792392641.

The spelling of 20678951 in words is "twenty million, six hundred seventy-eight thousand, nine hundred fifty-one".