20400111040440 has 128 divisors (see below), whose sum is σ = 65636901849600. Its totient is φ = 5056472378880.

The previous prime is 20400111040429. The next prime is 20400111040451. The reversal of 20400111040440 is 4404011100402.

It is an interprime number because it is at equal distance from previous prime (20400111040429) and next prime (20400111040451).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84288756 + ... + 84530435.

It is an arithmetic number, because the mean of its divisors is an integer number (512788295700).

Almost surely, 2^{20400111040440} is an apocalyptic number.

20400111040440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20400111040440 is an abundant number, since it is smaller than the sum of its proper divisors (45236790809160).

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

20400111040440 is a wasteful number, since it uses less digits than its factorization.

20400111040440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168819277 (or 168819273 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 20400111040440 its reverse (4404011100402), we get a palindrome (24804122140842).

The spelling of 20400111040440 in words is "twenty trillion, four hundred billion, one hundred eleven million, forty thousand, four hundred forty".