20345133 has 16 divisors (see below), whose sum is σ = 28632960. Its totient is φ = 12824064.

The previous prime is 20345093. The next prime is 20345161. The reversal of 20345133 is 33154302.

It is not a de Polignac number, because 20345133 - 2⁶ = 20345069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345033) 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 15 ways as a sum of consecutive naturals, for example, 4485 + ... + 7797.

It is an arithmetic number, because the mean of its divisors is an integer number (1789560).

Almost surely, 2^20345133 is an apocalyptic number.

20345133 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20345133 is a deficient number, since it is larger than the sum of its proper divisors (8287827).

20345133 is a wasteful number, since it uses less digits than its factorization.

20345133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3428.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 20345133 is about 4510.5579477488. The cubic root of 20345133 is about 272.9942571482.

Adding to 20345133 its reverse (33154302), we get a palindrome (53499435).

The spelling of 20345133 in words is "twenty million, three hundred forty-five thousand, one hundred thirty-three".