20678123 has 2 divisors, whose sum is σ = 20678124. Its totient is φ = 20678122.

The previous prime is 20678117. The next prime is 20678149. The reversal of 20678123 is 32187602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20678123 - 2⁶ = 20678059 is a prime.

It is not a weakly prime, because it can be changed into another prime (20678183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10339061 + 10339062.

It is an arithmetic number, because the mean of its divisors is an integer number (10339062).

Almost surely, 2^20678123 is an apocalyptic number.

20678123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20678123 is an equidigital number, since it uses as much as digits as its factorization.

20678123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20678123 is about 4547.3204197637. The cubic root of 20678123 is about 274.4755757668.

The spelling of 20678123 in words is "twenty million, six hundred seventy-eight thousand, one hundred twenty-three".