20011243240 has 32 divisors (see below), whose sum is σ = 45052425000. Its totient is φ = 7999674624.

The previous prime is 20011243229. The next prime is 20011243247. The reversal of 20011243240 is 4234211002.

It can be written as a sum of positive squares in 4 ways, for example, as 19352704996 + 658538244 = 139114^2 + 25662^2 .

It is not an unprimeable number, because it can be changed into a prime (20011243247) 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, 83115 + ... + 216634.

Almost surely, 2^20011243240 is an apocalyptic number.

20011243240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011243240 is an abundant number, since it is smaller than the sum of its proper divisors (25041181760).

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

20011243240 is a wasteful number, since it uses less digits than its factorization.

20011243240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301429 (or 301425 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20011243240 its reverse (4234211002), we get a palindrome (24245454242).

The spelling of 20011243240 in words is "twenty billion, eleven million, two hundred forty-three thousand, two hundred forty".