20303421 has 4 divisors (see below), whose sum is σ = 27071232. Its totient is φ = 13535612.

The previous prime is 20303351. The next prime is 20303431. The reversal of 20303421 is 12430302.

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 20303421 - 2¹⁰ = 20302397 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20303421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303431) 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, 3383901 + ... + 3383906.

It is an arithmetic number, because the mean of its divisors is an integer number (6767808).

Almost surely, 2^20303421 is an apocalyptic number.

It is an amenable number.

20303421 is a deficient number, since it is larger than the sum of its proper divisors (6767811).

20303421 is an equidigital number, since it uses as much as digits as its factorization.

20303421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6767810.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20303421 is about 4505.9317571397. The cubic root of 20303421 is about 272.8075634006.

Adding to 20303421 its reverse (12430302), we get a palindrome (32733723).

The spelling of 20303421 in words is "twenty million, three hundred three thousand, four hundred twenty-one".