20908423 has 2 divisors, whose sum is σ = 20908424. Its totient is φ = 20908422.

The previous prime is 20908411. The next prime is 20908427. The reversal of 20908423 is 32480902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20908423 - 2⁹ = 20907911 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20908391 and 20908400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20908427) 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, 10454211 + 10454212.

It is an arithmetic number, because the mean of its divisors is an integer number (10454212).

Almost surely, 2^20908423 is an apocalyptic number.

20908423 is a deficient number, since it is larger than the sum of its proper divisors (1).

20908423 is an equidigital number, since it uses as much as digits as its factorization.

20908423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20908423 is about 4572.5729081120. The cubic root of 20908423 is about 275.4907951773.

The spelling of 20908423 in words is "twenty million, nine hundred eight thousand, four hundred twenty-three".