20109265 has 16 divisors (see below), whose sum is σ = 26775360. Its totient is φ = 14374720.

The previous prime is 20109263. The next prime is 20109293. The reversal of 20109265 is 56290102.

It is not a de Polignac number, because 20109265 - 2¹ = 20109263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20109263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147 + ... + 6343.

It is an arithmetic number, because the mean of its divisors is an integer number (1673460).

Almost surely, 2^20109265 is an apocalyptic number.

It is an amenable number.

20109265 is a deficient number, since it is larger than the sum of its proper divisors (6666095).

20109265 is a wasteful number, since it uses less digits than its factorization.

20109265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6272.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20109265 is about 4484.3355137634. The cubic root of 20109265 is about 271.9351822555.

Adding to 20109265 its reverse (56290102), we get a palindrome (76399367).

The spelling of 20109265 in words is "twenty million, one hundred nine thousand, two hundred sixty-five".