20133243240 has 96 divisors (see below), whose sum is σ = 66389833440. Its totient is φ = 4880782720.

The previous prime is 20133243227. The next prime is 20133243311. The reversal of 20133243240 is 4234233102.

It is a super-2 number, since 2×20133243240² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20133243240.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 678774 + ... + 707813.

It is an arithmetic number, because the mean of its divisors is an integer number (691560765).

Almost surely, 2^20133243240 is an apocalyptic number.

20133243240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20133243240 is an abundant number, since it is smaller than the sum of its proper divisors (46256590200).

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

20133243240 is a wasteful number, since it uses less digits than its factorization.

20133243240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386623 (or 1386608 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 20133243240 its reverse (4234233102), we get a palindrome (24367476342).

The spelling of 20133243240 in words is "twenty billion, one hundred thirty-three million, two hundred forty-three thousand, two hundred forty".