20765438 has 8 divisors (see below), whose sum is σ = 31523688. Its totient is φ = 10257544.

The previous prime is 20765419. The next prime is 20765447. The reversal of 20765438 is 83456702.

It is a happy number.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20765398 and 20765407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62381 + ... + 62712.

It is an arithmetic number, because the mean of its divisors is an integer number (3940461).

Almost surely, 2^20765438 is an apocalyptic number.

20765438 is a deficient number, since it is larger than the sum of its proper divisors (10758250).

20765438 is a wasteful number, since it uses less digits than its factorization.

20765438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125178.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 20765438 is about 4556.9110151505. The cubic root of 20765438 is about 274.8613648326.

The spelling of 20765438 in words is "twenty million, seven hundred sixty-five thousand, four hundred thirty-eight".