20434321 has 2 divisors, whose sum is σ = 20434322. Its totient is φ = 20434320.

The previous prime is 20434319. The next prime is 20434369. The reversal of 20434321 is 12343402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18584721 + 1849600 = 4311^2 + 1360^2 .

It is a cyclic number.

It is not a de Polignac number, because 20434321 - 2¹ = 20434319 is a prime.

It is a super-2 number, since 2×20434321² = 835122949462082, which contains 22 as substring.

Together with 20434319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20464321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217160 + 10217161.

It is an arithmetic number, because the mean of its divisors is an integer number (10217161).

Almost surely, 2^20434321 is an apocalyptic number.

It is an amenable number.

20434321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20434321 is an equidigital number, since it uses as much as digits as its factorization.

20434321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 20434321 is about 4520.4337181293. The cubic root of 20434321 is about 273.3925886140.

Adding to 20434321 its reverse (12343402), we get a palindrome (32777723).

The spelling of 20434321 in words is "twenty million, four hundred thirty-four thousand, three hundred twenty-one".