20124240 has 80 divisors (see below), whose sum is σ = 63317376. Its totient is φ = 5286400.

The previous prime is 20124233. The next prime is 20124253. The reversal of 20124240 is 4242102.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16450 + ... + 17630.

Almost surely, 2^20124240 is an apocalyptic number.

20124240 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 20124240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31658688).

20124240 is an abundant number, since it is smaller than the sum of its proper divisors (43193136).

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

20124240 is a wasteful number, since it uses less digits than its factorization.

20124240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268 (or 1262 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 20124240 is about 4486.0049041436. The cubic root of 20124240 is about 272.0026672172.

Adding to 20124240 its reverse (4242102), we get a palindrome (24366342).

The spelling of 20124240 in words is "twenty million, one hundred twenty-four thousand, two hundred forty".