20718987584919 has 32 divisors (see below), whose sum is σ = 30239387555328. Its totient is φ = 12540573360000.

The previous prime is 20718987584917. The next prime is 20718987584989. The reversal of 20718987584919 is 91948578981702.

It is not a de Polignac number, because 20718987584919 - 2¹ = 20718987584917 is a prime.

It is a super-2 number, since 2×20718987584919² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20718987584917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57274924 + ... + 57635534.

It is an arithmetic number, because the mean of its divisors is an integer number (944980861104).

Almost surely, 2^{20718987584919} is an apocalyptic number.

20718987584919 is a deficient number, since it is larger than the sum of its proper divisors (9520399970409).

20718987584919 is a wasteful number, since it uses less digits than its factorization.

20718987584919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384839.

The product of its (nonzero) digits is 731566080, while the sum is 78.

The spelling of 20718987584919 in words is "twenty trillion, seven hundred eighteen billion, nine hundred eighty-seven million, five hundred eighty-four thousand, nine hundred nineteen".