20111200120 has 64 divisors (see below), whose sum is σ = 49872866400. Its totient is φ = 7237754880.

The previous prime is 20111200099. The next prime is 20111200133. The reversal of 20111200120 is 2100211102.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20111200097 and 20111200106.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 192925 + ... + 278284.

Almost surely, 2^20111200120 is an apocalyptic number.

20111200120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111200120 is an abundant number, since it is smaller than the sum of its proper divisors (29761666280).

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

20111200120 is a wasteful number, since it uses less digits than its factorization.

20111200120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471328 (or 471324 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20111200120 its reverse (2100211102), we get a palindrome (22211411222).

The spelling of 20111200120 in words is "twenty billion, one hundred eleven million, two hundred thousand, one hundred twenty".