20112042440 has 64 divisors (see below), whose sum is σ = 54758851200. Its totient is φ = 6489934848.

The previous prime is 20112042439. The next prime is 20112042443. The reversal of 20112042440 is 4424021102.

It is a super-2 number, since 2×20112042440² (a number of 21 digits) 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 (20112042443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2107850 + ... + 2117369.

It is an arithmetic number, because the mean of its divisors is an integer number (855607050).

Almost surely, 2^20112042440 is an apocalyptic number.

20112042440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20112042440 is an abundant number, since it is smaller than the sum of its proper divisors (34646808760).

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

20112042440 is a wasteful number, since it uses less digits than its factorization.

20112042440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4225254 (or 4225250 counting only the distinct ones).

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

Adding to 20112042440 its reverse (4424021102), we get a palindrome (24536063542).

The spelling of 20112042440 in words is "twenty billion, one hundred twelve million, forty-two thousand, four hundred forty".