20111217882 has 48 divisors (see below), whose sum is σ = 46802048832. Its totient is φ = 5744504640.

The previous prime is 20111217851. The next prime is 20111217887. The reversal of 20111217882 is 28871211102.

It is a happy number.

It is a super-2 number, since 2×20111217882² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20111217887) 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 23 ways as a sum of consecutive naturals, for example, 1487083 + ... + 1500545.

It is an arithmetic number, because the mean of its divisors is an integer number (975042684).

Almost surely, 2^20111217882 is an apocalyptic number.

20111217882 is an abundant number, since it is smaller than the sum of its proper divisors (26690830950).

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

20111217882 is a wasteful number, since it uses less digits than its factorization.

20111217882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18563 (or 18556 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 33.

Adding to 20111217882 its reverse (28871211102), we get a palindrome (48982428984).

The spelling of 20111217882 in words is "twenty billion, one hundred eleven million, two hundred seventeen thousand, eight hundred eighty-two".