20240665 has 12 divisors (see below), whose sum is σ = 24971436. Its totient is φ = 15749568.

The previous prime is 20240663. The next prime is 20240683. The reversal of 20240665 is 56604202.

It can be written as a sum of positive squares in 6 ways, for example, as 915849 + 19324816 = 957^2 + 4396^2 .

It is not a de Polignac number, because 20240665 - 2¹ = 20240663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20240663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5367 + ... + 8323.

It is an arithmetic number, because the mean of its divisors is an integer number (2080953).

Almost surely, 2^20240665 is an apocalyptic number.

It is an amenable number.

20240665 is a deficient number, since it is larger than the sum of its proper divisors (4730771).

20240665 is an equidigital number, since it uses as much as digits as its factorization.

20240665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3036 (or 2999 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20240665 is about 4498.9626582136. The cubic root of 20240665 is about 272.5261989793.

Adding to 20240665 its reverse (56604202), we get a palindrome (76844867).

The spelling of 20240665 in words is "twenty million, two hundred forty thousand, six hundred sixty-five".