20243421 has 36 divisors (see below), whose sum is σ = 33300540. Its totient is φ = 11827200.

The previous prime is 20243407. The next prime is 20243467. The reversal of 20243421 is 12434202.

20243421 is a `hidden beast` number, since 2 + 0 + 243 + 421 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14907321 + 5336100 = 3861^2 + 2310^2 .

It is not a de Polignac number, because 20243421 - 2⁶ = 20243357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20243394 and 20243403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20243471) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 31261 + ... + 31901.

It is an arithmetic number, because the mean of its divisors is an integer number (925015).

Almost surely, 2^20243421 is an apocalyptic number.

It is an amenable number.

20243421 is a deficient number, since it is larger than the sum of its proper divisors (13057119).

20243421 is a wasteful number, since it uses less digits than its factorization.

20243421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698 (or 684 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20243421 is about 4499.2689406169. The cubic root of 20243421 is about 272.5385676130.

Adding to 20243421 its reverse (12434202), we get a palindrome (32677623).

It can be divided in two parts, 2024 and 3421, that added together give a palindrome (5445).

The spelling of 20243421 in words is "twenty million, two hundred forty-three thousand, four hundred twenty-one".