20285983 has 2 divisors, whose sum is σ = 20285984. Its totient is φ = 20285982.

The previous prime is 20285963. The next prime is 20285989. The reversal of 20285983 is 38958202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20285983 - 2²¹ = 18188831 is a prime.

It is a super-2 number, since 2×20285983² = 823042212552578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20285989) 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, 10142991 + 10142992.

It is an arithmetic number, because the mean of its divisors is an integer number (10142992).

Almost surely, 2^20285983 is an apocalyptic number.

20285983 is a deficient number, since it is larger than the sum of its proper divisors (1).

20285983 is an equidigital number, since it uses as much as digits as its factorization.

20285983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 20285983 is about 4503.9963365882. The cubic root of 20285983 is about 272.7294389491.

The spelling of 20285983 in words is "twenty million, two hundred eighty-five thousand, nine hundred eighty-three".