20732265 has 48 divisors (see below), whose sum is σ = 39036816. Its totient is φ = 10137600.

The previous prime is 20732263. The next prime is 20732281. The reversal of 20732265 is 56223702.

It can be written as a sum of positive squares in 8 ways, for example, as 47961 + 20684304 = 219^2 + 4548^2 .

It is not a de Polignac number, because 20732265 - 2¹ = 20732263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20732263) 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, 31035 + ... + 31695.

It is an arithmetic number, because the mean of its divisors is an integer number (813267).

Almost surely, 2^20732265 is an apocalyptic number.

It is an amenable number.

20732265 is a deficient number, since it is larger than the sum of its proper divisors (18304551).

20732265 is a wasteful number, since it uses less digits than its factorization.

20732265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730 (or 727 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 20732265 is about 4553.2697042894. The cubic root of 20732265 is about 274.7149222081.

Adding to 20732265 its reverse (56223702), we get a palindrome (76955967).

The spelling of 20732265 in words is "twenty million, seven hundred thirty-two thousand, two hundred sixty-five".