20187916318 has 8 divisors (see below), whose sum is σ = 30986104248. Its totient is φ = 9859214904.

The previous prime is 20187916289. The next prime is 20187916319. The reversal of 20187916318 is 81361978102.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20187916319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117371521 + ... + 117371692.

It is an arithmetic number, because the mean of its divisors is an integer number (3873263031).

Almost surely, 2^20187916318 is an apocalyptic number.

20187916318 is a deficient number, since it is larger than the sum of its proper divisors (10798187930).

20187916318 is a wasteful number, since it uses less digits than its factorization.

20187916318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234743258.

The product of its (nonzero) digits is 145152, while the sum is 46.

The spelling of 20187916318 in words is "twenty billion, one hundred eighty-seven million, nine hundred sixteen thousand, three hundred eighteen".