20015265 has 16 divisors (see below), whose sum is σ = 33710400. Its totient is φ = 10112832.

The previous prime is 20015251. The next prime is 20015293. The reversal of 20015265 is 56251002.

It is not a de Polignac number, because 20015265 - 2¹⁸ = 19753121 is a prime.

It is a super-2 number, since 2×20015265² = 801221666040450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34830 + ... + 35399.

It is an arithmetic number, because the mean of its divisors is an integer number (2106900).

Almost surely, 2^20015265 is an apocalyptic number.

It is an amenable number.

20015265 is a deficient number, since it is larger than the sum of its proper divisors (13695135).

20015265 is a wasteful number, since it uses less digits than its factorization.

20015265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70256.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 20015265 is about 4473.8423083520. The cubic root of 20015265 is about 271.5108034053.

Adding to 20015265 its reverse (56251002), we get a palindrome (76266267).

The spelling of 20015265 in words is "twenty million, fifteen thousand, two hundred sixty-five".