20127581718 has 16 divisors (see below), whose sum is σ = 41643272880. Its totient is φ = 6477842336.

The previous prime is 20127581711. The next prime is 20127581737. The reversal of 20127581718 is 81718572102.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20127581718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20127581711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57837705 + ... + 57838052.

It is an arithmetic number, because the mean of its divisors is an integer number (2602704555).

Almost surely, 2^20127581718 is an apocalyptic number.

20127581718 is an abundant number, since it is smaller than the sum of its proper divisors (21515691162).

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

20127581718 is a wasteful number, since it uses less digits than its factorization.

20127581718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115675791.

The product of its (nonzero) digits is 62720, while the sum is 42.

The spelling of 20127581718 in words is "twenty billion, one hundred twenty-seven million, five hundred eighty-one thousand, seven hundred eighteen".