20001121120 has 24 divisors (see below), whose sum is σ = 47252649024. Its totient is φ = 8000448384.

The previous prime is 20001121097. The next prime is 20001121123. The reversal of 20001121120 is 2112110002.

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 = 20001121097 and 20001121106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001121123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62503344 + ... + 62503663.

It is an arithmetic number, because the mean of its divisors is an integer number (1968860376).

Almost surely, 2^20001121120 is an apocalyptic number.

20001121120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001121120 is an abundant number, since it is smaller than the sum of its proper divisors (27251527904).

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

20001121120 is a wasteful number, since it uses less digits than its factorization.

20001121120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125007022 (or 125007014 counting only the distinct ones).

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

Adding to 20001121120 its reverse (2112110002), we get a palindrome (22113231122).

The spelling of 20001121120 in words is "twenty billion, one million, one hundred twenty-one thousand, one hundred twenty".