20471265 has 64 divisors (see below), whose sum is σ = 40089600. Its totient is φ = 9865152.

The previous prime is 20471261. The next prime is 20471267. The reversal of 20471265 is 56217402.

It is not a de Polignac number, because 20471265 - 2² = 20471261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20471261) 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 63 ways as a sum of consecutive naturals, for example, 58822 + ... + 59168.

It is an arithmetic number, because the mean of its divisors is an integer number (626400).

Almost surely, 2^20471265 is an apocalyptic number.

It is an amenable number.

20471265 is a deficient number, since it is larger than the sum of its proper divisors (19618335).

20471265 is a wasteful number, since it uses less digits than its factorization.

20471265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20471265 is about 4524.5182063950. The cubic root of 20471265 is about 273.5572484371.

Adding to 20471265 its reverse (56217402), we get a palindrome (76688667).

It can be divided in two parts, 20471 and 265, that added together give a 4-th power (20736 = 12⁴).

The spelling of 20471265 in words is "twenty million, four hundred seventy-one thousand, two hundred sixty-five".