20111001120 has 144 divisors (see below), whose sum is σ = 78432943680. Its totient is φ = 4596797952.

The previous prime is 20111001109. The next prime is 20111001121. The reversal of 20111001120 is 2110011102.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is not an unprimeable number, because it can be changed into a prime (20111001121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 987490 + ... + 1007649.

It is an arithmetic number, because the mean of its divisors is an integer number (544673220).

Almost surely, 2^20111001120 is an apocalyptic number.

20111001120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111001120 is an abundant number, since it is smaller than the sum of its proper divisors (58321942560).

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

20111001120 is a wasteful number, since it uses less digits than its factorization.

20111001120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995167 (or 1995156 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20111001120 its reverse (2110011102), we get a palindrome (22221012222).

The spelling of 20111001120 in words is "twenty billion, one hundred eleven million, one thousand, one hundred twenty".