20113240 has 64 divisors (see below), whose sum is σ = 53524800. Its totient is φ = 6655488.

The previous prime is 20113231. The next prime is 20113253. The reversal of 20113240 is 4231102.

It is a self number, because there is not a number n which added to its sum of digits gives 20113240.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 6882 + ... + 9358.

It is an arithmetic number, because the mean of its divisors is an integer number (836325).

Almost surely, 2^20113240 is an apocalyptic number.

20113240 is a gapful number since it is divisible by the number (20) 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 20113240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26762400).

20113240 is an abundant number, since it is smaller than the sum of its proper divisors (33411560).

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

20113240 is a wasteful number, since it uses less digits than its factorization.

20113240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2524 (or 2520 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20113240 is about 4484.7787013408. The cubic root of 20113240 is about 271.9530988914.

Adding to 20113240 its reverse (4231102), we get a palindrome (24344342).

The spelling of 20113240 in words is "twenty million, one hundred thirteen thousand, two hundred forty".