20731142 has 8 divisors (see below), whose sum is σ = 32448816.
Its totient is φ = 9914872.
The previous prime is 20731133. The next prime is 20731153. The reversal of 20731142 is 24113702.
Adding to 20731142 its reverse (24113702), we get a palindrome (44844844).
It is a sphenic number, since it is the product of 3 distinct primes.
It is a congruent number.
It is an unprimeable number.
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, 225293 + ... + 225384.
It is an arithmetic number, because the mean of its divisors is an integer number (4056102).
Almost surely, 220731142 is an apocalyptic number.
20731142 is a deficient number, since it is larger than the sum of its proper divisors (11717674).
20731142 is a wasteful number, since it uses less digits than its factorization.
20731142 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 450702.
The product of its (nonzero) digits is 336, while the sum is 20.
The square root of 20731142 is about 4553.1463846444.
The cubic root of 20731142 is about 274.7099619778.
The spelling of 20731142 in words is "twenty million, seven hundred thirty-one thousand, one hundred forty-two".