20024551 has 4 divisors (see below), whose sum is σ = 20136600. Its totient is φ = 19912504.

The previous prime is 20024549. The next prime is 20024561. The reversal of 20024551 is 15542002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20024551 - 2¹ = 20024549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20024561) 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 3 ways as a sum of consecutive naturals, for example, 55756 + ... + 56113.

It is an arithmetic number, because the mean of its divisors is an integer number (5034150).

Almost surely, 2^20024551 is an apocalyptic number.

20024551 is a deficient number, since it is larger than the sum of its proper divisors (112049).

20024551 is a wasteful number, since it uses less digits than its factorization.

20024551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112048.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 20024551 is about 4474.8799983910. The cubic root of 20024551 is about 271.5527856875.

Adding to 20024551 its reverse (15542002), we get a palindrome (35566553).

The spelling of 20024551 in words is "twenty million, twenty-four thousand, five hundred fifty-one".