20404340868500 has 48 divisors (see below), whose sum is σ = 44565471739152. Its totient is φ = 8161298384000.

The previous prime is 20404340868493. The next prime is 20404340868503. The reversal of 20404340868500 is 586804340402.

It can be written as a sum of positive squares in 8 ways, for example, as 7194561623824 + 13209779244676 = 2682268^2 + 3634526^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404340868503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8312990 + ... + 10484010.

It is an arithmetic number, because the mean of its divisors is an integer number (928447327899).

Almost surely, 2^{20404340868500} is an apocalyptic number.

20404340868500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20404340868500 is an abundant number, since it is smaller than the sum of its proper divisors (24161130870652).

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

20404340868500 is a wasteful number, since it uses less digits than its factorization.

20404340868500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2189837 (or 2189825 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 44.

The spelling of 20404340868500 in words is "twenty trillion, four hundred four billion, three hundred forty million, eight hundred sixty-eight thousand, five hundred".