20000042 has 8 divisors (see below), whose sum is σ = 30309636. Its totient is φ = 9896832.

The previous prime is 20000033. The next prime is 20000047. The reversal of 20000042 is 24000002.

It can be written as a sum of positive squares in 2 ways, for example, as 19989841 + 10201 = 4471^2 + 101^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

20000042 is a modest number, since divided by 42 gives 20 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 19999984 and 20000029.

It is not an unprimeable number, because it can be changed into a prime (20000047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51353 + ... + 51740.

Almost surely, 2^20000042 is an apocalyptic number.

20000042 is a deficient number, since it is larger than the sum of its proper divisors (10309594).

20000042 is a wasteful number, since it uses less digits than its factorization.

20000042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103192.

The product of its (nonzero) digits is 16, while the sum is 8.

The square root of 20000042 is about 4472.1406507399. The cubic root of 20000042 is about 271.4419516686.

Adding to 20000042 its reverse (24000002), we get a palindrome (44000044).

The spelling of 20000042 in words is "twenty million, forty-two", and thus it is an aban number and an uban number.