20333421 has 12 divisors (see below), whose sum is σ = 29662620. Its totient is φ = 13420800.

The previous prime is 20333407. The next prime is 20333459. The reversal of 20333421 is 12433302.

It can be written as a sum of positive squares in 2 ways, for example, as 15444900 + 4888521 = 3930^2 + 2211^2 .

It is not a de Polignac number, because 20333421 - 2⁷ = 20333293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20333394 and 20333403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20335421) 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 11 ways as a sum of consecutive naturals, for example, 10276 + ... + 12093.

It is an arithmetic number, because the mean of its divisors is an integer number (2471885).

Almost surely, 2^20333421 is an apocalyptic number.

It is an amenable number.

20333421 is a deficient number, since it is larger than the sum of its proper divisors (9329199).

20333421 is a wasteful number, since it uses less digits than its factorization.

20333421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22476 (or 22473 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 20333421 is about 4509.2594735721. The cubic root of 20333421 is about 272.9418625949.

Adding to 20333421 its reverse (12433302), we get a palindrome (32766723).

The spelling of 20333421 in words is "twenty million, three hundred thirty-three thousand, four hundred twenty-one".