20675983 has 2 divisors, whose sum is σ = 20675984. Its totient is φ = 20675982.

The previous prime is 20675969. The next prime is 20676017. The reversal of 20675983 is 38957602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20675983 - 2⁹ = 20675471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20675923) 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 as a sum of consecutive naturals, namely, 10337991 + 10337992.

It is an arithmetic number, because the mean of its divisors is an integer number (10337992).

Almost surely, 2^20675983 is an apocalyptic number.

20675983 is a deficient number, since it is larger than the sum of its proper divisors (1).

20675983 is an equidigital number, since it uses as much as digits as its factorization.

20675983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 20675983 is about 4547.0851102657. The cubic root of 20675983 is about 274.4661068545.

The spelling of 20675983 in words is "twenty million, six hundred seventy-five thousand, nine hundred eighty-three".