24720140 has 24 divisors (see below), whose sum is σ = 54645360. Its totient is φ = 9367488.

The previous prime is 24720133. The next prime is 24720149. The reversal of 24720140 is 4102742.

It is a super-2 number, since 2×24720140² = 1222170643239200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (24720149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32147 + ... + 32906.

It is an arithmetic number, because the mean of its divisors is an integer number (2276890).

Almost surely, 2^24720140 is an apocalyptic number.

24720140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

24720140 is an abundant number, since it is smaller than the sum of its proper divisors (29925220).

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

24720140 is a wasteful number, since it uses less digits than its factorization.

24720140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65081 (or 65079 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 24720140 is about 4971.9352369073. The cubic root of 24720140 is about 291.3065894817.

Adding to 24720140 its reverse (4102742), we get a palindrome (28822882).

The spelling of 24720140 in words is "twenty-four million, seven hundred twenty thousand, one hundred forty".