20424465 has 12 divisors (see below), whose sum is σ = 35402484. Its totient is φ = 10893024.

The previous prime is 20424431. The next prime is 20424491. The reversal of 20424465 is 56442402.

It can be written as a sum of positive squares in 2 ways, for example, as 9054081 + 11370384 = 3009^2 + 3372^2 .

It is not a de Polignac number, because 20424465 - 2⁶ = 20424401 is a prime.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 226894 + ... + 226983.

It is an arithmetic number, because the mean of its divisors is an integer number (2950207).

Almost surely, 2^20424465 is an apocalyptic number.

It is an amenable number.

20424465 is a deficient number, since it is larger than the sum of its proper divisors (14978019).

20424465 is a wasteful number, since it uses less digits than its factorization.

20424465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453888 (or 453885 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 20424465 is about 4519.3434257644. The cubic root of 20424465 is about 273.3486267800.

Adding to 20424465 its reverse (56442402), we get a palindrome (76866867).

The spelling of 20424465 in words is "twenty million, four hundred twenty-four thousand, four hundred sixty-five".