20424469 has 4 divisors (see below), whose sum is σ = 21995596. Its totient is φ = 18853344.

The previous prime is 20424431. The next prime is 20424491. The reversal of 20424469 is 96442402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8439025 + 11985444 = 2905^2 + 3462^2 .

It is a cyclic number.

It is not a de Polignac number, because 20424469 - 2¹¹ = 20422421 is a prime.

It is a super-2 number, since 2×20424469² = 834317867863922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20424469.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785544 + ... + 785569.

It is an arithmetic number, because the mean of its divisors is an integer number (5498899).

Almost surely, 2^20424469 is an apocalyptic number.

It is an amenable number.

20424469 is a deficient number, since it is larger than the sum of its proper divisors (1571127).

20424469 is a wasteful number, since it uses less digits than its factorization.

20424469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571126.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 20424469 is about 4519.3438683065. The cubic root of 20424469 is about 273.3486446245.

The spelling of 20424469 in words is "twenty million, four hundred twenty-four thousand, four hundred sixty-nine".