20133645 has 16 divisors (see below), whose sum is σ = 36816000. Its totient is φ = 9203904.

The previous prime is 20133629. The next prime is 20133649. The reversal of 20133645 is 54633102.

It is a happy number.

It is not a de Polignac number, because 20133645 - 2⁴ = 20133629 is a prime.

It is a super-3 number, since 3×20133645³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20133649) 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, 95770 + ... + 95979.

It is an arithmetic number, because the mean of its divisors is an integer number (2301000).

Almost surely, 2^20133645 is an apocalyptic number.

It is an amenable number.

20133645 is a deficient number, since it is larger than the sum of its proper divisors (16682355).

20133645 is a wasteful number, since it uses less digits than its factorization.

20133645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191764.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20133645 is about 4487.0530418082. The cubic root of 20133645 is about 272.0450338137.

Adding to 20133645 its reverse (54633102), we get a palindrome (74766747).

The spelling of 20133645 in words is "twenty million, one hundred thirty-three thousand, six hundred forty-five".