20765439 has 12 divisors (see below), whose sum is σ = 30045600. Its totient is φ = 13820064.

The previous prime is 20765419. The next prime is 20765447. The reversal of 20765439 is 93456702.

It is not a de Polignac number, because 20765439 - 2⁸ = 20765183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20765419) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4867 + ... + 8075.

It is an arithmetic number, because the mean of its divisors is an integer number (2503800).

Almost surely, 2^20765439 is an apocalyptic number.

20765439 is a deficient number, since it is larger than the sum of its proper divisors (9280161).

20765439 is a wasteful number, since it uses less digits than its factorization.

20765439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3934 (or 3931 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 20765439 is about 4556.9111248740. The cubic root of 20765439 is about 274.8613692448.

The spelling of 20765439 in words is "twenty million, seven hundred sixty-five thousand, four hundred thirty-nine".