20665340500400 has 60 divisors (see below), whose sum is σ = 49649304272400. Its totient is φ = 8265999056640.

The previous prime is 20665340500367. The next prime is 20665340500411. The reversal of 20665340500400 is 400504356602.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25699646 + ... + 26491554.

It is an arithmetic number, because the mean of its divisors is an integer number (827488404540).

Almost surely, 2^{20665340500400} is an apocalyptic number.

20665340500400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20665340500400 is an abundant number, since it is smaller than the sum of its proper divisors (28983963772000).

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

20665340500400 is a wasteful number, since it uses less digits than its factorization.

20665340500400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857166 (or 857155 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

The spelling of 20665340500400 in words is "twenty trillion, six hundred sixty-five billion, three hundred forty million, five hundred thousand, four hundred".