20404343 has 2 divisors, whose sum is σ = 20404344. Its totient is φ = 20404342.

The previous prime is 20404337. The next prime is 20404361. The reversal of 20404343 is 34340402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20404343 - 2¹⁶ = 20338807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20404393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202171 + 10202172.

It is an arithmetic number, because the mean of its divisors is an integer number (10202172).

Almost surely, 2^20404343 is an apocalyptic number.

20404343 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404343 is an equidigital number, since it uses as much as digits as its factorization.

20404343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 20404343 is about 4517.1166688497. The cubic root of 20404343 is about 273.2588304116.

Adding to 20404343 its reverse (34340402), we get a palindrome (54744745).

The spelling of 20404343 in words is "twenty million, four hundred four thousand, three hundred forty-three".