20112404240 has 20 divisors (see below), whose sum is σ = 46761340044. Its totient is φ = 8044961664.

The previous prime is 20112404237. The next prime is 20112404243. The reversal of 20112404240 is 4240421102.

It is an interprime number because it is at equal distance from previous prime (20112404237) and next prime (20112404243).

It can be written as a sum of positive squares in 2 ways, for example, as 11702046976 + 8410357264 = 108176^2 + 91708^2 .

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

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 (20112404243) 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, 125702447 + ... + 125702606.

Almost surely, 2^20112404240 is an apocalyptic number.

20112404240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20112404240 is an abundant number, since it is smaller than the sum of its proper divisors (26648935804).

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

20112404240 is a wasteful number, since it uses less digits than its factorization.

20112404240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251405066 (or 251405060 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 20112404240 its reverse (4240421102), we get a palindrome (24352825342).

The spelling of 20112404240 in words is "twenty billion, one hundred twelve million, four hundred four thousand, two hundred forty".