20142243 has 16 divisors (see below), whose sum is σ = 32553600. Its totient is φ = 12207240.

The previous prime is 20142209. The next prime is 20142247. The reversal of 20142243 is 34224102.

20142243 is a `hidden beast` number, since 201 + 422 + 43 = 666.

It is not a de Polignac number, because 20142243 - 2¹⁷ = 20011171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20142247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33613 + ... + 34206.

It is an arithmetic number, because the mean of its divisors is an integer number (2034600).

Almost surely, 2^20142243 is an apocalyptic number.

20142243 is a deficient number, since it is larger than the sum of its proper divisors (12411357).

20142243 is a wasteful number, since it uses less digits than its factorization.

20142243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67839 (or 67833 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20142243 is about 4488.0110293982. The cubic root of 20142243 is about 272.0837535839.

Adding to 20142243 its reverse (34224102), we get a palindrome (54366345).

The spelling of 20142243 in words is "twenty million, one hundred forty-two thousand, two hundred forty-three".