20111145156 has 96 divisors (see below), whose sum is σ = 56776944000. Its totient is φ = 6131873664.

The previous prime is 20111145151. The next prime is 20111145199. The reversal of 20111145156 is 65154111102.

20111145156 is a `hidden beast` number, since 20 + 11 + 114 + 515 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20111145151) 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, 109471 + ... + 228486.

It is an arithmetic number, because the mean of its divisors is an integer number (591426500).

Almost surely, 2^20111145156 is an apocalyptic number.

It is an amenable number.

20111145156 is an abundant number, since it is smaller than the sum of its proper divisors (36665798844).

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

20111145156 is a wasteful number, since it uses less digits than its factorization.

20111145156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338018 (or 338010 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

Adding to 20111145156 its reverse (65154111102), we get a palindrome (85265256258).

The spelling of 20111145156 in words is "twenty billion, one hundred eleven million, one hundred forty-five thousand, one hundred fifty-six".