20000542 has 4 divisors (see below), whose sum is σ = 30000816. Its totient is φ = 10000270.

The previous prime is 20000537. The next prime is 20000543. The reversal of 20000542 is 24500002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

20000542 is a modest number, since divided by 542 gives 200 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000543) 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, 5000134 + ... + 5000137.

It is an arithmetic number, because the mean of its divisors is an integer number (7500204).

Almost surely, 2^20000542 is an apocalyptic number.

20000542 is a deficient number, since it is larger than the sum of its proper divisors (10000274).

20000542 is a wasteful number, since it uses less digits than its factorization.

20000542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10000273.

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 20000542 is about 4472.1965520312. The cubic root of 20000542 is about 271.4442136613. Note that the first 3 decimals are identical.

Adding to 20000542 its reverse (24500002), we get a palindrome (44500544).

The spelling of 20000542 in words is "twenty million, five hundred forty-two", and thus it is an aban number.