20011243120 has 80 divisors (see below), whose sum is σ = 51258549600. Its totient is φ = 7204736000.

The previous prime is 20011243073. The next prime is 20011243129. The reversal of 20011243120 is 2134211002.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 20011243094 and 20011243103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011243129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23695 + ... + 201454.

It is an arithmetic number, because the mean of its divisors is an integer number (640731870).

Almost surely, 2^20011243120 is an apocalyptic number.

20011243120 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 20011243120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25629274800).

20011243120 is an abundant number, since it is smaller than the sum of its proper divisors (31247306480).

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

20011243120 is a wasteful number, since it uses less digits than its factorization.

20011243120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225274 (or 225268 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20011243120 its reverse (2134211002), we get a palindrome (22145454122).

The spelling of 20011243120 in words is "twenty billion, eleven million, two hundred forty-three thousand, one hundred twenty".