20168211385 has 64 divisors (see below), whose sum is σ = 29285222400. Its totient is φ = 13042778112.

The previous prime is 20168211383. The next prime is 20168211403. The reversal of 20168211385 is 58311286102.

It is not a de Polignac number, because 20168211385 - 2¹ = 20168211383 is a prime.

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 in 63 ways as a sum of consecutive naturals, for example, 7776649 + ... + 7779241.

It is an arithmetic number, because the mean of its divisors is an integer number (457581600).

Almost surely, 2^20168211385 is an apocalyptic number.

It is an amenable number.

20168211385 is a deficient number, since it is larger than the sum of its proper divisors (9117011015).

20168211385 is a wasteful number, since it uses less digits than its factorization.

20168211385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2810.

The product of its (nonzero) digits is 23040, while the sum is 37.

Adding to 20168211385 its reverse (58311286102), we get a palindrome (78479497487).

The spelling of 20168211385 in words is "twenty billion, one hundred sixty-eight million, two hundred eleven thousand, three hundred eighty-five".