20168211386 has 4 divisors (see below), whose sum is σ = 30252317082. Its totient is φ = 10084105692.

The previous prime is 20168211383. The next prime is 20168211403. The reversal of 20168211386 is 68311286102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15382200625 + 4786010761 = 124025^2 + 69181^2 .

It is not an unprimeable number, because it can be changed into a prime (20168211383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5042052845 + ... + 5042052848.

Almost surely, 2^20168211386 is an apocalyptic number.

20168211386 is a deficient number, since it is larger than the sum of its proper divisors (10084105696).

20168211386 is a wasteful number, since it uses less digits than its factorization.

20168211386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10084105695.

The product of its (nonzero) digits is 27648, while the sum is 38.

Adding to 20168211386 its reverse (68311286102), we get a palindrome (88479497488).

The spelling of 20168211386 in words is "twenty billion, one hundred sixty-eight million, two hundred eleven thousand, three hundred eighty-six".