20433121 has 4 divisors (see below), whose sum is σ = 20536000. Its totient is φ = 20330244.

The previous prime is 20433097. The next prime is 20433137. The reversal of 20433121 is 12133402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20433121 - 2⁹ = 20432609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20433095 and 20433104.

It is not an unprimeable number, because it can be changed into a prime (20433181) 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 3 ways as a sum of consecutive naturals, for example, 51141 + ... + 51538.

It is an arithmetic number, because the mean of its divisors is an integer number (5134000).

Almost surely, 2^20433121 is an apocalyptic number.

It is an amenable number.

20433121 is a deficient number, since it is larger than the sum of its proper divisors (102879).

20433121 is a wasteful number, since it uses less digits than its factorization.

20433121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102878.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20433121 is about 4520.3009855539. The cubic root of 20433121 is about 273.3872368739.

Adding to 20433121 its reverse (12133402), we get a palindrome (32566523).

The spelling of 20433121 in words is "twenty million, four hundred thirty-three thousand, one hundred twenty-one".