20421203 has 8 divisors (see below), whose sum is σ = 22310400. Its totient is φ = 18537480.

The previous prime is 20421187. The next prime is 20421209. The reversal of 20421203 is 30212402.

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

It is a cyclic number.

It is not a de Polignac number, because 20421203 - 2⁴ = 20421187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20421209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13898 + ... + 15296.

It is an arithmetic number, because the mean of its divisors is an integer number (2788800).

Almost surely, 2^20421203 is an apocalyptic number.

20421203 is a deficient number, since it is larger than the sum of its proper divisors (1889197).

20421203 is a wasteful number, since it uses less digits than its factorization.

20421203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2737.

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

The square root of 20421203 is about 4518.9825182224. The cubic root of 20421203 is about 273.3340737967.

Adding to 20421203 its reverse (30212402), we get a palindrome (50633605).

The spelling of 20421203 in words is "twenty million, four hundred twenty-one thousand, two hundred three".