20424253 has 4 divisors (see below), whose sum is σ = 21312288. Its totient is φ = 19536220.

The previous prime is 20424247. The next prime is 20424263. The reversal of 20424253 is 35242402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20424253 - 2¹³ = 20416061 is a prime.

It is a super-2 number, since 2×20424253² = 834300221216018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424263) 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, 443983 + ... + 444028.

It is an arithmetic number, because the mean of its divisors is an integer number (5328072).

Almost surely, 2^20424253 is an apocalyptic number.

20424253 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20424253 is a deficient number, since it is larger than the sum of its proper divisors (888035).

20424253 is an equidigital number, since it uses as much as digits as its factorization.

20424253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888034.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 20424253 is about 4519.3199709691. The cubic root of 20424253 is about 273.3476810170.

Adding to 20424253 its reverse (35242402), we get a palindrome (55666655).

The spelling of 20424253 in words is "twenty million, four hundred twenty-four thousand, two hundred fifty-three".