20231240 has 16 divisors (see below), whose sum is σ = 45520380. Its totient is φ = 8092480.

The previous prime is 20231203. The next prime is 20231243. The reversal of 20231240 is 4213202.

It can be written as a sum of positive squares in 2 ways, for example, as 18852964 + 1378276 = 4342^2 + 1174^2 .

It is not an unprimeable number, because it can be changed into a prime (20231243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252851 + ... + 252930.

Almost surely, 2^20231240 is an apocalyptic number.

20231240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20231240 is an abundant number, since it is smaller than the sum of its proper divisors (25289140).

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

20231240 is a wasteful number, since it uses less digits than its factorization.

20231240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505792 (or 505788 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20231240 is about 4497.9150725642. The cubic root of 20231240 is about 272.4838920984.

Adding to 20231240 its reverse (4213202), we get a palindrome (24444442).

The spelling of 20231240 in words is "twenty million, two hundred thirty-one thousand, two hundred forty".