20231985 has 16 divisors (see below), whose sum is σ = 32921280. Its totient is φ = 10607040.

The previous prime is 20231977. The next prime is 20231987. The reversal of 20231985 is 58913202.

It is a happy number.

It is not a de Polignac number, because 20231985 - 2³ = 20231977 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20231987) 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 in 15 ways as a sum of consecutive naturals, for example, 10546 + ... + 12315.

It is an arithmetic number, because the mean of its divisors is an integer number (2057580).

Almost surely, 2^20231985 is an apocalyptic number.

It is an amenable number.

20231985 is a deficient number, since it is larger than the sum of its proper divisors (12689295).

20231985 is a wasteful number, since it uses less digits than its factorization.

20231985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22928.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 20231985 is about 4497.9978879497. The cubic root of 20231985 is about 272.4872367279.

The spelling of 20231985 in words is "twenty million, two hundred thirty-one thousand, nine hundred eighty-five".