20678629 has 2 divisors, whose sum is σ = 20678630. Its totient is φ = 20678628.

The previous prime is 20678591. The next prime is 20678659. The reversal of 20678629 is 92687602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20493729 + 184900 = 4527^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 20678629 - 2⁹ = 20678117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20678591 and 20678600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20678659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10339314 + 10339315.

It is an arithmetic number, because the mean of its divisors is an integer number (10339315).

Almost surely, 2^20678629 is an apocalyptic number.

It is an amenable number.

20678629 is a deficient number, since it is larger than the sum of its proper divisors (1).

20678629 is an equidigital number, since it uses as much as digits as its factorization.

20678629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 20678629 is about 4547.3760565847. The cubic root of 20678629 is about 274.4778145823.

The spelling of 20678629 in words is "twenty million, six hundred seventy-eight thousand, six hundred twenty-nine".