20120111000 has 128 divisors (see below), whose sum is σ = 51734592000. Its totient is φ = 7263216000.

The previous prime is 20120110981. The next prime is 20120111003. The reversal of 20120111000 is 11102102.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120111003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1522421 + ... + 1535579.

It is an arithmetic number, because the mean of its divisors is an integer number (404176500).

Almost surely, 2^20120111000 is an apocalyptic number.

20120111000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20120111000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25867296000).

20120111000 is an abundant number, since it is smaller than the sum of its proper divisors (31614481000).

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

20120111000 is a wasteful number, since it uses less digits than its factorization.

20120111000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13330 (or 13316 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 20120111000 its reverse (11102102), we get a palindrome (20131213102).

The spelling of 20120111000 in words is "twenty billion, one hundred twenty million, one hundred eleven thousand".