20765436 has 24 divisors (see below), whose sum is σ = 49763280. Its totient is φ = 6734592.

The previous prime is 20765419. The next prime is 20765447. The reversal of 20765436 is 63456702.

It is a junction number, because it is equal to n+sod(n) for n = 20765397 and 20765406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22941 + ... + 23828.

It is an arithmetic number, because the mean of its divisors is an integer number (2073470).

Almost surely, 2^20765436 is an apocalyptic number.

It is an amenable number.

20765436 is an abundant number, since it is smaller than the sum of its proper divisors (28997844).

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

20765436 is a wasteful number, since it uses less digits than its factorization.

20765436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46813 (or 46811 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 20765436 is about 4556.9107957036. The cubic root of 20765436 is about 274.8613560083.

It can be divided in two parts, 207654 and 36, that added together give a triangular number (207690 = T₆₄₄).

The spelling of 20765436 in words is "twenty million, seven hundred sixty-five thousand, four hundred thirty-six".