20180240 has 20 divisors (see below), whose sum is σ = 46919244. Its totient is φ = 8072064.

The previous prime is 20180239. The next prime is 20180257. The reversal of 20180240 is 4208102.

It can be written as a sum of positive squares in 2 ways, for example, as 8456464 + 11723776 = 2908^2 + 3424^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126047 + ... + 126206.

Almost surely, 2^20180240 is an apocalyptic number.

20180240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20180240 is an abundant number, since it is smaller than the sum of its proper divisors (26739004).

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

20180240 is a wasteful number, since it uses less digits than its factorization.

20180240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252266 (or 252260 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 20180240 is about 4492.2422018409. The cubic root of 20180240 is about 272.2547354073.

Adding to 20180240 its reverse (4208102), we get a palindrome (24388342).

The spelling of 20180240 in words is "twenty million, one hundred eighty thousand, two hundred forty".