20433921 has 8 divisors (see below), whose sum is σ = 27322560. Its totient is φ = 13583952.

The previous prime is 20433887. The next prime is 20433943. The reversal of 20433921 is 12933402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20433921 - 2⁶ = 20433857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20433891 and 20433900.

It is not an unprimeable number, because it can be changed into a prime (20433971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8410 + ... + 10563.

It is an arithmetic number, because the mean of its divisors is an integer number (3415320).

Almost surely, 2^20433921 is an apocalyptic number.

It is an amenable number.

20433921 is a deficient number, since it is larger than the sum of its proper divisors (6888639).

20433921 is a wasteful number, since it uses less digits than its factorization.

20433921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19335.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20433921 is about 4520.3894743705. The cubic root of 20433921 is about 273.3908047239.

The spelling of 20433921 in words is "twenty million, four hundred thirty-three thousand, nine hundred twenty-one".