20909095 has 4 divisors (see below), whose sum is σ = 25090920. Its totient is φ = 16727272.

The previous prime is 20909089. The next prime is 20909117. The reversal of 20909095 is 59090902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20909095 - 2⁷ = 20908967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20909095.

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 3 ways as a sum of consecutive naturals, for example, 2090905 + ... + 2090914.

It is an arithmetic number, because the mean of its divisors is an integer number (6272730).

Almost surely, 2^20909095 is an apocalyptic number.

20909095 is a deficient number, since it is larger than the sum of its proper divisors (4181825).

20909095 is an equidigital number, since it uses as much as digits as its factorization.

20909095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4181824.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 20909095 is about 4572.6463891274. The cubic root of 20909095 is about 275.4937465848.

Adding to 20909095 its reverse (59090902), we get a palindrome (79999997).

The spelling of 20909095 in words is "twenty million, nine hundred nine thousand, ninety-five".