20001201120 has 144 divisors (see below), whose sum is σ = 71221786272. Its totient is φ = 5101747200.

The previous prime is 20001201089. The next prime is 20001201127. The reversal of 20001201120 is 2110210002.

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001201127) 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, 268831 + ... + 335070.

It is an arithmetic number, because the mean of its divisors is an integer number (494595738).

Almost surely, 2^20001201120 is an apocalyptic number.

20001201120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001201120 is an abundant number, since it is smaller than the sum of its proper divisors (51220585152).

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

20001201120 is a wasteful number, since it uses less digits than its factorization.

20001201120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603945 (or 603934 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20001201120 its reverse (2110210002), we get a palindrome (22111411122).

The spelling of 20001201120 in words is "twenty billion, one million, two hundred one thousand, one hundred twenty".