20434431 has 4 divisors (see below), whose sum is σ = 27245912. Its totient is φ = 13622952.

The previous prime is 20434411. The next prime is 20434457. The reversal of 20434431 is 13443402.

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

It is not a de Polignac number, because 20434431 - 2¹¹ = 20432383 is a prime.

It is a super-2 number, since 2×20434431² = 835131940587522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 20434398 and 20434407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3405736 + ... + 3405741.

It is an arithmetic number, because the mean of its divisors is an integer number (6811478).

Almost surely, 2^20434431 is an apocalyptic number.

20434431 is a deficient number, since it is larger than the sum of its proper divisors (6811481).

20434431 is an equidigital number, since it uses as much as digits as its factorization.

20434431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6811480.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 20434431 is about 4520.4458850870. The cubic root of 20434431 is about 273.3930791797.

Adding to 20434431 its reverse (13443402), we get a palindrome (33877833).

The spelling of 20434431 in words is "twenty million, four hundred thirty-four thousand, four hundred thirty-one".