20203421 has 8 divisors (see below), whose sum is σ = 23626944. Its totient is φ = 16914240.

The previous prime is 20203411. The next prime is 20203423. The reversal of 20203421 is 12430202.

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

It is a de Polignac number, because none of the positive numbers 2^k-20203421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 20203396 and 20203405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33260 + ... + 33861.

It is an arithmetic number, because the mean of its divisors is an integer number (2953368).

Almost surely, 2^20203421 is an apocalyptic number.

It is an amenable number.

20203421 is a deficient number, since it is larger than the sum of its proper divisors (3423523).

20203421 is an equidigital number, since it uses as much as digits as its factorization.

20203421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67171.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20203421 is about 4494.8215759916. The cubic root of 20203421 is about 272.3589416677.

Adding to 20203421 its reverse (12430202), we get a palindrome (32633623).

The spelling of 20203421 in words is "twenty million, two hundred three thousand, four hundred twenty-one".