20440402240040 has 32 divisors (see below), whose sum is σ = 46969434938880. Its totient is φ = 8002200025152.

The previous prime is 20440402239991. The next prime is 20440402240043. The reversal of 20440402240040 is 4004220404402.

It is a junction number, because it is equal to n+sod(n) for n = 20440402239991 and 20440402240009.

It is not an unprimeable number, because it can be changed into a prime (20440402240043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5436275312 + ... + 5436279071.

It is an arithmetic number, because the mean of its divisors is an integer number (1467794841840).

Almost surely, 2^{20440402240040} is an apocalyptic number.

20440402240040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20440402240040 is an abundant number, since it is smaller than the sum of its proper divisors (26529032698840).

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

20440402240040 is a wasteful number, since it uses less digits than its factorization.

20440402240040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10872554441 (or 10872554437 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 26.

Adding to 20440402240040 its reverse (4004220404402), we get a palindrome (24444622644442).

The spelling of 20440402240040 in words is "twenty trillion, four hundred forty billion, four hundred two million, two hundred forty thousand, forty".