20765238 has 16 divisors (see below), whose sum is σ = 44725296. Its totient is φ = 6389280.

The previous prime is 20765237. The next prime is 20765287. The reversal of 20765238 is 83256702.

It is a junction number, because it is equal to n+sod(n) for n = 20765199 and 20765208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20765231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133033 + ... + 133188.

It is an arithmetic number, because the mean of its divisors is an integer number (2795331).

Almost surely, 2^20765238 is an apocalyptic number.

20765238 is an abundant number, since it is smaller than the sum of its proper divisors (23960058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20765238 is a wasteful number, since it uses less digits than its factorization.

20765238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266239.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 20765238 is about 4556.8890704076. The cubic root of 20765238 is about 274.8604823976.

It can be divided in two parts, 207652 and 38, that added together give a triangular number (207690 = T₆₄₄).

The spelling of 20765238 in words is "twenty million, seven hundred sixty-five thousand, two hundred thirty-eight".