20133240 has 32 divisors (see below), whose sum is σ = 60400080. Its totient is φ = 5368832.

The previous prime is 20133199. The next prime is 20133247. The reversal of 20133240 is 4233102.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20133247) 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 7 ways as a sum of consecutive naturals, for example, 83769 + ... + 84008.

Almost surely, 2^20133240 is an apocalyptic number.

20133240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20133240 is an abundant number, since it is smaller than the sum of its proper divisors (40266840).

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

20133240 is a wasteful number, since it uses less digits than its factorization.

20133240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167791 (or 167787 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20133240 is about 4487.0079117381. The cubic root of 20133240 is about 272.0432096867.

Adding to 20133240 its reverse (4233102), we get a palindrome (24366342).

It can be divided in two parts, 2013 and 3240, that added together give a triangular number (5253 = T₁₀₂).

The spelling of 20133240 in words is "twenty million, one hundred thirty-three thousand, two hundred forty".