20120240 has 160 divisors (see below), whose sum is σ = 59043840. Its totient is φ = 6220800.

The previous prime is 20120237. The next prime is 20120251. The reversal of 20120240 is 4202102.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 329810 + ... + 329870.

It is an arithmetic number, because the mean of its divisors is an integer number (369024).

Almost surely, 2^20120240 is an apocalyptic number.

20120240 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 20120240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29521920).

20120240 is an abundant number, since it is smaller than the sum of its proper divisors (38923600).

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

20120240 is a wasteful number, since it uses less digits than its factorization.

20120240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 20120240 is about 4485.5590509991. The cubic root of 20120240 is about 271.9846444619.

Adding to 20120240 its reverse (4202102), we get a palindrome (24322342).

The spelling of 20120240 in words is "twenty million, one hundred twenty thousand, two hundred forty".