20005142 has 4 divisors (see below), whose sum is σ = 30007716. Its totient is φ = 10002570.

The previous prime is 20005129. The next prime is 20005159. The reversal of 20005142 is 24150002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24150002 = 2 ⋅12075001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5001284 + ... + 5001287.

It is an arithmetic number, because the mean of its divisors is an integer number (7501929).

Almost surely, 2^20005142 is an apocalyptic number.

20005142 is a deficient number, since it is larger than the sum of its proper divisors (10002574).

20005142 is a wasteful number, since it uses less digits than its factorization.

20005142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10002573.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 20005142 is about 4472.7108111301. The cubic root of 20005142 is about 271.4650222251.

Adding to 20005142 its reverse (24150002), we get a palindrome (44155144).

The spelling of 20005142 in words is "twenty million, five thousand, one hundred forty-two".