20731042 has 8 divisors (see below), whose sum is σ = 31758336. Its totient is φ = 10144932.

The previous prime is 20731001. The next prime is 20731043. The reversal of 20731042 is 24013702.

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

It is a super-2 number, since 2×20731042² = 859552204811528, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20731043) 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, 110178 + ... + 110365.

It is an arithmetic number, because the mean of its divisors is an integer number (3969792).

Almost surely, 2^20731042 is an apocalyptic number.

20731042 is a deficient number, since it is larger than the sum of its proper divisors (11027294).

20731042 is a wasteful number, since it uses less digits than its factorization.

20731042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220592.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20731042 is about 4553.1354032139. The cubic root of 20731042 is about 274.7095202745.

Adding to 20731042 its reverse (24013702), we get a palindrome (44744744).

The spelling of 20731042 in words is "twenty million, seven hundred thirty-one thousand, forty-two".