20111147667 has 32 divisors (see below), whose sum is σ = 32204712960. Its totient is φ = 12330364320.

The previous prime is 20111147593. The next prime is 20111147681. The reversal of 20111147667 is 76674111102.

It is not a de Polignac number, because 20111147667 - 2¹¹ = 20111145619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20111147167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10593 + ... + 200834.

It is an arithmetic number, because the mean of its divisors is an integer number (1006397280).

Almost surely, 2^20111147667 is an apocalyptic number.

20111147667 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20111147667 is a deficient number, since it is larger than the sum of its proper divisors (12093565293).

20111147667 is a wasteful number, since it uses less digits than its factorization.

20111147667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211720 (or 211714 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

Adding to 20111147667 its reverse (76674111102), we get a palindrome (96785258769).

The spelling of 20111147667 in words is "twenty billion, one hundred eleven million, one hundred forty-seven thousand, six hundred sixty-seven".