20787757478012 has 24 divisors (see below), whose sum is σ = 41575637072256. Its totient is φ = 8909012751408.

The previous prime is 20787757478011. The next prime is 20787757478023. The reversal of 20787757478012 is 21087475778702.

It is a self number, because there is not a number n which added to its sum of digits gives 20787757478012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20787757478011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10942463 + ... + 12700905.

It is an arithmetic number, because the mean of its divisors is an integer number (1732318211344).

Almost surely, 2^{20787757478012} is an apocalyptic number.

It is an amenable number.

20787757478012 is an abundant number, since it is smaller than the sum of its proper divisors (20787879594244).

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

20787757478012 is a wasteful number, since it uses less digits than its factorization.

20787757478012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2180657 (or 2180655 counting only the distinct ones).

The product of its (nonzero) digits is 86051840, while the sum is 65.

The spelling of 20787757478012 in words is "twenty trillion, seven hundred eighty-seven billion, seven hundred fifty-seven million, four hundred seventy-eight thousand, twelve".