20345265 has 48 divisors (see below), whose sum is σ = 36691200. Its totient is φ = 10423296.

The previous prime is 20345261. The next prime is 20345267. The reversal of 20345265 is 56254302.

20345265 = T₂₁₄ + T₂₁₅ + ... + T₅₀₈.

20345265 is a `hidden beast` number, since 203 + 452 + 6 + 5 = 666.

It is not a de Polignac number, because 20345265 - 2² = 20345261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20345261) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 209697 + ... + 209793.

It is an arithmetic number, because the mean of its divisors is an integer number (764400).

Almost surely, 2^20345265 is an apocalyptic number.

It is an amenable number.

20345265 is a deficient number, since it is larger than the sum of its proper divisors (16345935).

20345265 is a wasteful number, since it uses less digits than its factorization.

20345265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 20345265 is about 4510.5725800612. The cubic root of 20345265 is about 272.9948475460.

Adding to 20345265 its reverse (56254302), we get a palindrome (76599567).

The spelling of 20345265 in words is "twenty million, three hundred forty-five thousand, two hundred sixty-five".