20424551 has 8 divisors (see below), whose sum is σ = 23385120. Its totient is φ = 17474688.

The previous prime is 20424539. The next prime is 20424577. The reversal of 20424551 is 15542402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20424551 - 2¹⁰ = 20423527 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 (20424511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1955 + ... + 6683.

It is an arithmetic number, because the mean of its divisors is an integer number (2923140).

Almost surely, 2^20424551 is an apocalyptic number.

20424551 is a deficient number, since it is larger than the sum of its proper divisors (2960569).

20424551 is an equidigital number, since it uses as much as digits as its factorization.

20424551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5353.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 20424551 is about 4519.3529404108. The cubic root of 20424551 is about 273.3490104367.

Adding to 20424551 its reverse (15542402), we get a palindrome (35966953).

The spelling of 20424551 in words is "twenty million, four hundred twenty-four thousand, five hundred fifty-one".