20706423 has 4 divisors (see below), whose sum is σ = 27608568. Its totient is φ = 13804280.

The previous prime is 20706407. The next prime is 20706431. The reversal of 20706423 is 32460702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20706423 - 2⁴ = 20706407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20706393 and 20706402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20706823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3451068 + ... + 3451073.

It is an arithmetic number, because the mean of its divisors is an integer number (6902142).

Almost surely, 2^20706423 is an apocalyptic number.

20706423 is a deficient number, since it is larger than the sum of its proper divisors (6902145).

20706423 is an equidigital number, since it uses as much as digits as its factorization.

20706423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6902144.

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 20706423 is about 4550.4310784804. The cubic root of 20706423 is about 274.6007340946.

The spelling of 20706423 in words is "twenty million, seven hundred six thousand, four hundred twenty-three".