20154142 has 4 divisors (see below), whose sum is σ = 30231216. Its totient is φ = 10077070.

The previous prime is 20154137. The next prime is 20154149. The reversal of 20154142 is 24145102.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20154149) 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, 5038534 + ... + 5038537.

It is an arithmetic number, because the mean of its divisors is an integer number (7557804).

Almost surely, 2^20154142 is an apocalyptic number.

20154142 is a deficient number, since it is larger than the sum of its proper divisors (10077074).

20154142 is a wasteful number, since it uses less digits than its factorization.

20154142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10077073.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 20154142 is about 4489.3364765854. The cubic root of 20154142 is about 272.1373207275.

Adding to 20154142 its reverse (24145102), we get a palindrome (44299244).

The spelling of 20154142 in words is "twenty million, one hundred fifty-four thousand, one hundred forty-two".