20415265 has 16 divisors (see below), whose sum is σ = 26686800. Its totient is φ = 14902272.

The previous prime is 20415257. The next prime is 20415293. The reversal of 20415265 is 56251402.

It can be written as a sum of positive squares in 8 ways, for example, as 7862416 + 12552849 = 2804^2 + 3543^2 .

It is a cyclic number.

It is not a de Polignac number, because 20415265 - 2³ = 20415257 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4021 + ... + 7549.

It is an arithmetic number, because the mean of its divisors is an integer number (1667925).

Almost surely, 2^20415265 is an apocalyptic number.

It is an amenable number.

20415265 is a deficient number, since it is larger than the sum of its proper divisors (6271535).

20415265 is a wasteful number, since it uses less digits than its factorization.

20415265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3636.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 20415265 is about 4518.3254641515. The cubic root of 20415265 is about 273.3075782131.

Adding to 20415265 its reverse (56251402), we get a palindrome (76666667).

The spelling of 20415265 in words is "twenty million, four hundred fifteen thousand, two hundred sixty-five".