20343421 has 16 divisors (see below), whose sum is σ = 24167808. Its totient is φ = 16761600.

The previous prime is 20343419. The next prime is 20343473. The reversal of 20343421 is 12434302.

It is a cyclic number.

It is not a de Polignac number, because 20343421 - 2¹ = 20343419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20343481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20466 + ... + 21436.

It is an arithmetic number, because the mean of its divisors is an integer number (1510488).

Almost surely, 2^20343421 is an apocalyptic number.

It is an amenable number.

20343421 is a deficient number, since it is larger than the sum of its proper divisors (3824387).

20343421 is an equidigital number, since it uses as much as digits as its factorization.

20343421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 20343421 is about 4510.3681667908. The cubic root of 20343421 is about 272.9865996365.

Adding to 20343421 its reverse (12434302), we get a palindrome (32777723).

The spelling of 20343421 in words is "twenty million, three hundred forty-three thousand, four hundred twenty-one".