20090765 has 16 divisors (see below), whose sum is σ = 25159680. Its totient is φ = 15382080.

The previous prime is 20090747. The next prime is 20090773. The reversal of 20090765 is 56709002.

It is not a de Polignac number, because 20090765 - 2²⁰ = 19042189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17870 + ... + 18960.

It is an arithmetic number, because the mean of its divisors is an integer number (1572480).

Almost surely, 2^20090765 is an apocalyptic number.

It is an amenable number.

20090765 is a deficient number, since it is larger than the sum of its proper divisors (5068915).

20090765 is a wasteful number, since it uses less digits than its factorization.

20090765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 20090765 is about 4482.2723031962. The cubic root of 20090765 is about 271.8517655751.

Adding to 20090765 its reverse (56709002), we get a palindrome (76799767).

The spelling of 20090765 in words is "twenty million, ninety thousand, seven hundred sixty-five".