20787757478013 has 8 divisors (see below), whose sum is σ = 27717715377376. Its totient is φ = 13858152282000.

The previous prime is 20787757478011. The next prime is 20787757478023. The reversal of 20787757478013 is 31087475778702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20787757478013 - 2¹ = 20787757478011 is a prime.

It is a Duffinian number.

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, 88038283 + ... + 88274088.

It is an arithmetic number, because the mean of its divisors is an integer number (3464714422172).

Almost surely, 2^{20787757478013} is an apocalyptic number.

It is an amenable number.

20787757478013 is a deficient number, since it is larger than the sum of its proper divisors (6929957899363).

20787757478013 is a wasteful number, since it uses less digits than its factorization.

20787757478013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176351675.

The product of its (nonzero) digits is 129077760, while the sum is 66.

The spelling of 20787757478013 in words is "twenty trillion, seven hundred eighty-seven billion, seven hundred fifty-seven million, four hundred seventy-eight thousand, thirteen".