20840433 has 12 divisors (see below), whose sum is σ = 28085040. Its totient is φ = 13745872.

The previous prime is 20840429. The next prime is 20840459. The reversal of 20840433 is 33404802.

It is not a de Polignac number, because 20840433 - 2² = 20840429 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20840033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105691 + ... + 105887.

It is an arithmetic number, because the mean of its divisors is an integer number (2340420).

Almost surely, 2^20840433 is an apocalyptic number.

It is an amenable number.

20840433 is a deficient number, since it is larger than the sum of its proper divisors (7244607).

20840433 is an equidigital number, since it uses as much as digits as its factorization.

20840433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 20840433 is about 4565.1323091450. The cubic root of 20840433 is about 275.1918573017.

The spelling of 20840433 in words is "twenty million, eight hundred forty thousand, four hundred thirty-three".