20507983 has 2 divisors, whose sum is σ = 20507984. Its totient is φ = 20507982.

The previous prime is 20507969. The next prime is 20507999. The reversal of 20507983 is 38970502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20507983 - 2⁹ = 20507471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20507483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10253991 + 10253992.

It is an arithmetic number, because the mean of its divisors is an integer number (10253992).

Almost surely, 2^20507983 is an apocalyptic number.

20507983 is a deficient number, since it is larger than the sum of its proper divisors (1).

20507983 is an equidigital number, since it uses as much as digits as its factorization.

20507983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 20507983 is about 4528.5740581335. The cubic root of 20507983 is about 273.7207048014.

The spelling of 20507983 in words is "twenty million, five hundred seven thousand, nine hundred eighty-three".