20133144 has 64 divisors (see below), whose sum is σ = 56649600. Its totient is φ = 6624288.

The previous prime is 20133137. The next prime is 20133149. The reversal of 20133144 is 44133102.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20133149) 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 15 ways as a sum of consecutive naturals, for example, 17367 + ... + 18489.

It is an arithmetic number, because the mean of its divisors is an integer number (885150).

Almost surely, 2^20133144 is an apocalyptic number.

20133144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20133144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28324800).

20133144 is an abundant number, since it is smaller than the sum of its proper divisors (36516456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20133144 is a wasteful number, since it uses less digits than its factorization.

20133144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221 (or 1211 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20133144 is about 4486.9972141734. The cubic root of 20133144 is about 272.0427772975.

Adding to 20133144 its reverse (44133102), we get a palindrome (64266246).

The spelling of 20133144 in words is "twenty million, one hundred thirty-three thousand, one hundred forty-four".