20688043 has 2 divisors, whose sum is σ = 20688044. Its totient is φ = 20688042.

The previous prime is 20688013. The next prime is 20688071. The reversal of 20688043 is 34088602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20688043 - 2⁵ = 20688011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20687996 and 20688014.

It is not a weakly prime, because it can be changed into another prime (20688013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10344021 + 10344022.

It is an arithmetic number, because the mean of its divisors is an integer number (10344022).

Almost surely, 2^20688043 is an apocalyptic number.

20688043 is a deficient number, since it is larger than the sum of its proper divisors (1).

20688043 is an equidigital number, since it uses as much as digits as its factorization.

20688043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 20688043 is about 4548.4110412319. The cubic root of 20688043 is about 274.5194605111.

The spelling of 20688043 in words is "twenty million, six hundred eighty-eight thousand, forty-three".