20090775 has 12 divisors (see below), whose sum is σ = 33216872. Its totient is φ = 10715040.

The previous prime is 20090773. The next prime is 20090789. The reversal of 20090775 is 57709002.

It is a happy number.

It is not a de Polignac number, because 20090775 - 2¹ = 20090773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20090773) 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, 133864 + ... + 134013.

Almost surely, 2^20090775 is an apocalyptic number.

20090775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20090775 is a deficient number, since it is larger than the sum of its proper divisors (13126097).

20090775 is a wasteful number, since it uses less digits than its factorization.

20090775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267890 (or 267885 counting only the distinct ones).

The product of its (nonzero) digits is 4410, while the sum is 30.

The square root of 20090775 is about 4482.2734187017. The cubic root of 20090775 is about 271.8518106790.

Adding to 20090775 its reverse (57709002), we get a palindrome (77799777).

The spelling of 20090775 in words is "twenty million, ninety thousand, seven hundred seventy-five".